>>> TONIGHT, SIMONE BILES AND TEAM USA RIDING THEIR SPECTACULAR REDEMPTION STORY AS THEY TAKE THE GOLD HERE IN PARIS. THE U.S. WOMEN'S GYMNASTICS TEAM BACK ON TOP OF THE PODIUM AFTER A STUNNING PERFORMANCE IN THE TEAM FINAL. SIMONE BILES, THREE YEARS AFTER WITHDRAWING FROM THE SAME EVENT IN TOKYO, COMING BACK TO LEAD THE TEAM TO VICTORY. AND SHE'S TALKING TO US TONIGHT AFTER BECOMING THE MOST DECORATED U.S. GYMNAST IN OLYMPICS HISTORY. >>> ALSO TONIGHT, THE ACTING HEAD OF THE SECRET SERVICE TELLING CONGRESS HE'S ASHAMED AT WHAT HE SAW AFTER THE ATTEMPTED ASSASSINATION OF DONALD TRUMP. >>> AND OUR EXCLUSIVE. ATTORNEY GENERAL MERRICK GARLAND ONE-ON-ONE. WE ASK HOW ALARMED HE WAS A GUNMAN GOT A CLEAR SHOT AT A FORMER PRESIDENT. HOW HE ANSWERED. >>> ISRAEL STRIKES BACK, TARGETING A HEZBOLLAH COMMANDER IN BEIRUT AFTER THE SOCCER FIELD ATTACK THAT KILLED 12 CHILDREN. >>> THE RACE FOR THE WHITE HOUSE. KAMALA HARRIS CAMPAIGNING IN A KEY BATTLEGROUND TONIGHT AS HER VEEPSTAKES FIELD NARROWS. AND THE DIRECTOR OF THE PRO-TRUMP PROJECT 2025 ABRUPTLY STEPPING DOWN. >>> THE CATASTROPHIC FLASH FLOOD EMERGENCY IN VERMONT. >>> THE NEW RESEARCH ON WEIGHT LOSS DRUGS. CAN THEY PROTECT AGAINST ALZHEIMER'S? >>> AND THEY CALL HER THE TROUBLEMAKER FROM TEXAS. HER CITY'S FIRST OLYMPIAN, FIGHTING FOR GOLD HERE IN PARIS. >> Announcer: THIS IS "NBC NIGHTLY NEWS" REPORTING TONIGHT FROM THE OLYMPICS IN PARIS. HERE IS LESTER HOLT. >> GOOD EVENING AND WELCOME FROM THE FRENCH CAPITAL, WHERE TONIGHT THE TEAM USA WOMEN'S GYMNASTS ARE SAMPLING THE SWEET TASTE OF REDEMPTION. SIMONE BILES LEADING HER TEAM IN A DOMINANT WIN OVER ITALY AND BRAZIL. THE AMERICANS LEAPING THEIR WAY TO THE TOP OF THE PODIUM TO CLAIM THE GOLD THAT FELL JUST OUT OF THEIR REACH THREE YEARS AGO IN JAPAN. SIMONE BILES EARNING HER EIGHTH OLYMPIC MEDAL. HER TEAM'S WIN TONIGHT HELPING TO KEEP THE U.S. ATOP THE OVERALL MEDAL COUNT HERE AT 26, AHEAD OF FRANCE AND CHINA, WHICH BOTH LEAD THE U.S. IN GOLD MEDALS. BUT THERE IS DISAPPOINTMENT FOR ANOTHER BIG NAME COMPETING HERE. AMERICAN TENNIS SENSATION COCO GAUFF UPSET IN SINGLES, DASHING HER CHANCE AT AN INDIVIDUAL MEDAL. AND STEPHANIE GOSK JOINS ME. STEPHANIE, YOU WERE AT THE GYMNASTICS ARENA TODAY. WHAT WAS IT LIKE? >> IT WAS INCREDIBLE, LESTER. WE SAW THIS TEAM STRUGGLE IN TOKYO. TONIGHT IN FRONT OF A HUGE CROWD, THEY LOOKED STRONG, THEY LOOKED CONFIDENT, AND THEY BROUGHT THE HOUSE DOWN. THE REDEMPTION TOUR JUST MADE ITS FIRST STOP. TEAM USA WINNING GOLD AND PUTTING A POINT ON IT. WITH VERY FEW MISTAKES, ROUTINE AFTER ROUTINE AND STICKING THE LANDINGS. >> WOW! >> SIMONE BILES LED THE TEAM, FLIPPING, TWISTING, AND SOARING LIKE ONLY SHE CAN. >> ALREADY THE GREATEST GYMNAST IN HISTORY. >> Reporter: AND THE CROWD, A WHOLE LOT OF THEM, READY TO WELCOME HER BACK AND CHEER HER ON. SIMONE BILES IS JUST ABOUT TO START HER FLOOR EXERCISE RIGHT NOW. TO GET A SENSE OF HOW MANY TEAM USA AND SPECIFICALLY SIMONE BILES FANS THERE ARE IN THIS CROWD, JUST GIVE IT A SECOND. [ CHEERING ] AND THERE IT IS. BACK AT HOME THEY WERE CHEERING TOO AT JORDAN CHILES AND SIMONE'S GYM, EVEN PERFORMING JORDAN'S FLOOR ROUTINE ALONG WITH HER. BY THE FINAL ROTATION, IT WAS CLEAR THE MEDAL WAS THEIRS. THE STRUGGLES BACK IN TOKYO IN THE REAR VIEW MIRROR. >> YOU GUYS DUG DEEP TO GET THAT SILVER IN TOKYO. HOW DOES THIS MOMENT COMPARE? >> OH, MY GOSH, THIS ONE, IT'S SO DIFFERENT. I FEEL LIKE WE HAD SO MUCH MORE FUN THIS TIME, CLEARLY. AND -- >> YEAH. >> I DON'T KNOW. WE DID. IT WAS SO DIFFERENT. SO IT'S NICE TO BE ABLE TO LOOK UP AND SEE YOUR FAMILY IN THE STANDS. >> DID YOU GUYS HEAR HOW MUCH LOUDER THEY WERE CHEERING FOR YOU? >> DID WE! WE WERE NERVOUS WE WEREN'T GOING TO HEAR OUR FLOOR MUSIC AND ALL OF THAT, BUT WE REALLY EMBRACED THE MOMENT AND HAD FUN WITH IT. >> Reporter: FRESH OFF THE PODIUM, THEY WERE CLEARLY EXCITED AND PROBABLY A BIT RELIEVED. >> WE ALL KNEW WHAT THE JOB WAS ONCE WE GOT IN HERE. IT WAS NOT MUCH, BUT WE ALL HAD IT IN THE BACK OF OUR MINDS. >> Reporter: WITH THIS MEDAL, BILES BECOMES THE MOST DECORATED U.S. GYMNAST IN HISTORY. AND SHE IS NOT DONE YET. THE INDIVIDUAL EVENTS ARE UP NEXT. THE GYMNASTS AREN'T THE ONLY ONES ADDING TO THE MEDAL HAUL. IN THE POOL, THE U.S. WON FOUR MORE, MAKING THE SWIM TEAM'S TOTAL 15. BUT THE TRIATHLETES DIDN'T GET TO SWIM. TWO DAYS OF RAIN OVER THE WEEKEND LEFT THE SEINE UNSAFE. THE CLEANUP WAS $1.5 MILLION. IT INCLUDED A NEW SEWAGE SYSTEM. THE GOAL WAS TO GET PEOPLE SWIMMING IN THE RIVER. BUT ON SUNDAY PRACTICE WAS CANDLED. MONDAY PRACTICE WAS CANCELED, AND TODAY THE TRIATHLON WAS POSTPONED. ON THE RUGBY FIELD, THEY PLAYED, AND THE WOMEN PUT ON A SHOW. >> THERE IT IS! THERE IT IS! >> Reporter: RALLYING FROM BEHIND TWICE TO WIN BRONZE. THE FIRST MEDAL FOR THE U.S. IN RUGBY IN 100 YEARS. >> IT FEELS LIKE GOLD TO THEM. >> Reporter: STEPHANIE GOSK, NBC NEWS, PARIS. >>> AND TONIGHT ON PRIME-TIME IN PARIS, SIMONE BILES AND TEAM USA COMPETE FOR GOLD IN THE WOMEN'S GYMNASTICS TEAM FINAL AT 8:00 P.M. EASTERN, ALL ON NBC AND PEACOCK. >>> THE ACTING HEAD OF THE SECRET SERVICE TOLD CONGRESS TODAY THE ATTEMPTED ASSASSINATION OF FORMER PRESIDENT TRUMP COULD HAVE BEEN PREVENTED. IN AN EXCLUSIVE INTERVIEW, ATTORNEY GENERAL MERRICK GARLAND CALLED IT EXTREMELY ALARMING. HERE IS KEN DILANIAN. >> Reporter: TONIGHT, 17 DAYS AFTER FORMER PRESIDENT TRUMP SURVIVED AN ASSASSINATION ATTEMPT BY A GUNMAN ON A ROOFTOP, A REMARKABLE ADMISSION FROM THE ACTING SECRET SERVICE DIRECTOR WHO SAYS HE WENT TO THE RALLY SITE. >> I LAID IN A PRONE POSITION TO EVALUATE HIS LINE OF SIGHT. WHAT I SAW MADE ME ASHAMED. AS A CAREER LAW ENFORCEMENT OFFICER AND A 25-YEAR VETERAN WITH THE SECRET SERVICE, I CANNOT DEFEND WHY THAT ROOF WAS NOT BETTER SECURED. >> Reporter: TODAY WE PRESSED ATTORNEY GENERAL MERRICK GARLAND IN AN EXCLUSIVE INTERVIEW. >> YOU HEARD THE ACTING SECRET SERVICE DIRECTOR SAY TODAY THAT HE WAS ASHAMED OF THE SECURITY FAILURES THAT ALMOST COST A FORMER PRESIDENT HIS LIFE. AS THE NATION'S TOP LAW ENFORCEMENT OFFICER, HOW DO YOU FEEL ABOUT WHAT HAPPENED? >> THIS ATTACK ON A FORMER PRESIDENT WAS A HEINOUS ATTACK ON FORMER PRESIDENT TRUMP, BUT ALSO A HEINOUS ATTACK ON OUR DEMOCRACY ITSELF. THIS WAS A MAJOR SECURITY FAILURE. >> Reporter: HOW ALARMED ARE YOU THAT A 20-YEAR-OLD WAS ABLE TO GET A CLEAR SHOT 150 YARDS FROM A FORMER PRESIDENT? >> SO THIS IS EXTREMELY ALARMING. THAT'S WHY WE HAVE TO FIND OUT WHAT HAPPENED HERE, WHY IT HAPPENED AND MAKE SURE IT DOESN'T HAPPEN AGAIN. >> Reporter: IN A HEARING TODAY, ACTING SECRET SERVICE DIRECTOR RONALD ROWE GRILLED BY LAWMAKERS. >> STOP INTERRUPTING ME. >> GO AHEAD, SENATOR. >> YOU'RE REFUSING TO ANSWER CLEAR AND DIRECT QUESTIONS. >> Reporter: DEMANDING TO KNOW WHY NO ONE HAS BEEN FIRED YET. >> WE ARE INVESTIGATING THIS. >> WHAT MORE DO YOU NEED TO INVESTIGATE TO KNOW THERE WERE CRITICAL ENOUGH FAILURES THAT SOME INDIVIDUALS OUGHT TO BE HELD ACCOUNTABLE? WHAT MORE DO YOU NEED TO KNOW? >> WHAT I NEED TO KNOW IS EXACTLY WHAT HAPPENED. >> Reporter: ROWE ACKNOWLEDGING THE ASSASSINATION ATTEMPT COULD HAVE BEEN PREVENTED IF HIS AGENCY HAD DEPLOYED TECHNOLOGY THAT WOULD HAVE REVEALED THE GUNMAN FLEW A DRONE OVERHEAD TWO HOURS BEFORE MR. TRUMP SPOKE. >> I FEEL AS THOUGH WE COULD HAVE PERHAPS FOUND HIM. WE COULD HAVE MAYBE STOPPED HIM. >> Reporter: THE DEPUTY FBI DIRECTOR REVEALING THE DISCOVERY OF A SOCIAL MEDIA ACCOUNT LINKED TO THE GUNMAN, THOUGH NOT YET VERIFIED. >> SOME OF THESE COMMENTS APPEAR TO REFLECT ANTISEMITIC AND ANTI-IMMIGRATION THEMES, TO ESPOUSE POLITICAL VIOLENCE. >> Reporter: WHILE GARLAND TELLING US MORE ABOUT THE IRANIAN THREAT AGAINST MR. TRUMP AND OTHER FORMER U.S. OFFICIALS. >> OUR INTELLIGENCE COMMUNITY HAS MADE CLEAR THAT WE BELIEVE THAT THE IRANIANS ARE ATTEMPTING TO KILL OR INJURE FORMER HIGH GOVERNMENT OFFICIALS. THIS IS AN ONGOING ISSUE. WE HAVE ONGOING INVESTIGATIONS. >> Reporter: YOU DON'T THINK WE'VE SEEN THE END? >> I DON'T THINK WE'VE SEEN THE END OF IRANIAN PLOTTING, NO. >> Reporter: MEANWHILE, BOTH GARLAND AND THE FBI SAID THERE IS NO DOUBT FORMER PRESIDENT TRUMP WAS HIT BY A BULLET. LESTER? >> KEN DILANIAN, THANKS. >>> ISRAEL HAS STRUCK BACK AFTER THAT ROCKET ATTACK THAT KILLED A DOZEN CHILDREN OVER THE WEEKEND, LAUNCHING AN AIR STRIKE NEAR BEIRUT. AT LEAST ONE WOMAN REPORTED DEAD, DOZENS INJURED. MATT BRADLEY IS THERE TONIGHT. MATT, WHAT'S THE LATEST? >> Reporter: GOOD EVENING, LESTER. ISRAEL SAID IT STRUCK A STRONGHOLD WITH THE MILITANT GROUP HEZBOLLAH HERE IN THE LEBANON'S CAPITAL. IN THE ATTACK, THE FDS SAYS KILLED FUAD SHUKR. HE SAID A SOCCER ATTACK IN THE GOLAN HEIGHTS OVER THE WEEKEND THAT KILLED 12 CHILDREN AND TEENAGERS, BUT THERE ARE FEARS HERE, LESTER, THIS MIGHT NOT BE OVER. TONIGHT'S ATTACK COULD SPARK A WIDER CONFLICT SEPARATE FROM THE FIGHTING IN GAZA. THE WHITE HOUSE TONIGHT SAID IT DOESN'T BELIEVE ALL-OUT WAR IS INEVITABLE. BUT THAT'S GOING DEPEND ON HEZBOLLAH AND ISRAEL, WHETHER THEY DECIDE TO ESCALATE OR STEP BACK FROM THE BRINK. LESTER? >> ALL RIGHT, MATT BRADLEY, THANKS. >>> VICE PRESIDENT KAMALA HARRIS IS CAMPAIGNING IN BATTLEGROUND GEORGIA TONIGHT AS THE TRUMP CAMPAIGN SHARPENS ITS ATTACK. PETER ALEXANDER IS ON THE CAMPAIGN TRAIL. VICE PRESIDENT HARRIS TONIGHT ARRIVING IN GEORGIA, A STATE THE DEMOCRATS FEARED WAS BECOMING OUT OF REACH. BUT NOW WITH THE NEW LIKELY NOMINEE, HOPE TO WIN AGAIN. EARLIER, ASKED WHETHER SHE PICKED A RUNNING MATE, THE HARRIS CAMPAIGN TODAY UNVEILING ITS FIRST TV AD, TOUTING HER TIME AS A LOCAL AND STATE PROSECUTOR IN CALIFORNIA, CALLING HER FEARLESS. >> SHE PUT MURDERERS AND ABUSERS BEHIND BARS. KAMALA HARRIS HAS ALWAYS KNOWN WHO SHE REPRESENTS. >> Reporter: MEANWHILE, TRUMP RUNNING MATE J.D. VANCE IS SET TO VISIT THE BORDER THURSDAY TO ATTACK THE BIDEN-HARRIS ADMINISTRATION AS WEAK ON ILLEGAL IMMIGRATION. >> AFTER BRINGING THEM ALL HERE, THEY PROPOSED AMNESTY FOR MILLIONS OF ILLEGAL ALIENS. SHE MIGHT AS WELL HAVE INVITED THEM PERSONALLY TO BREAK OUR LAWS AND COME INTO OUR COUNTRY. >> Reporter: IT'S ALSO THE FOCUS OF THIS NEW TRUMP AD. >> UNDER HARRIS, OTHER 10 MILLION ILLEGALLY HERE. >> Reporter: FORMER PRESIDENT TRUMP OVERNIGHT DEFENDING VANCE'S CONTROVERSIAL COMMENTS FROM 2021, CRITICAL OF DEMOCRATIC LEADERS WHO ARE, QUOTE, CHILDLESS CAT LADIES, REFERENCING VANCE'S RISE FROM POVERTY. >> HE GREW UP IN A VERY INTERESTING FAMILY SITUATION, AND HE FEELS FAMILY IS GOOD. AND I DON'T THINK THERE IS ANYTHING WRONG IN SAYING THAT. >> Reporter: WHILE TONIGHT THE DIRECTOR OF A CONSERVATIVE GROUP'S PROJECT 2025 VISION CALLING FOR AN OVERHAUL OF THE FEDERAL GOVERNMENT HAS STEPPED DOWN. THE GROUP FACED ESCALATING DEMOCRATIC ATTACKS. IT COMES AFTER TRUMP SHARPLY CRITICIZED PROJECT 2025 THAT'S RUN BY A NUMBER OF HIS ALLIES. THE TRUMP CAMPAIGN SAYING REPORTS OF PROJECT 2025'S DEMISE WOULD BE GREATLY WELCOMED. MEANWHILE, IN THE CRUCIAL ATLANTA SUBURBS, DEMOCRAT KIM LOUDERMILK WAS ANXIOUS WHEN PRESIDENT BIDEN DROPPED OUT OF THE RACE. >> I WAS WORRIED IT WAS TOO CLOSE TO THE ELECTION AND THAT, YOU KNOW, IT WOULD BE HARD TO GET A CAMPAIGN TOGETHER. >> Reporter: AND NOW WHAT DO YOU THINK? >> AND NOW I'M SUPER EXCITED ABOUT KAMALA. >> Reporter: BUT REPUBLICAN BEN WILSON BLAMES BOTH BIDEN AND HARRIS FOR HIGH PRICES. >> EVERYTHING FROM GAS PRICES TO, YOU KNOW, JUST EGGS, THE COST OF LIVING, EVERYTHING, THE ECONOMY. >> Reporter: AND WE'LL LEARN VICE PRESIDENT HARRIS' RUNNING MATE CHOICE SOON. TWO CHOICES FAMILIAR WITH THE MATTER TELL NBC NEWS THEY WILL TOUR BATTLEGROUND STATES TOGETHER BEGINNING NEXT WEEK. LESTER? >> PETER ALEXANDER, THANKS. >>> WE'RE FOLLOWING A FLASH FLOODING EMERGENCY IN NORTHERN VERMONT, WHERE MORE THAN 8 INCHES OF RAIN CAME DOWN IN SOME PLACES, WIPING OUT ROADS, PUSHING HOUSES OFF THEIR FOUNDATIONS, AND TRAPPING PEOPLE INSIDE. AUTHORITIES CONDUCTED ABOUT TWO DOZEN SWIFT WATER RESCUES. SOME OF THE SAME AREAS WERE HIT BY FLOODING JUST THREE WEEKS AGO. >>> IN 60 SECONDS, THE SURPRISING DRUG SHOWING PROMISE IN TREATING ALZHEIMER'S. >>> AND OUR NEW REPORTING ON THE SHOOTING OF SONYA MASSEY. WHAT THE SHERIFF WHO HIRED THE DEPUTY CHARGED WITH MURDER IS SAYING, RIGHT AFTE >>> BACK NOW WITH THE GROWING OUTRAGE OVER THE KILLING OF SONYA MASSEY. THE ILLINOIS SHERIFF WHO OVERSAW THE DEPUTY WHO FATALLY SHOT MASSEY PUBLICLY APOLOGIZING, BUT REFUSING CALLS TO STEP DOWN. HERE IS MAGGIE VESPA. >> SONYA MASSEY, I SPEAK HER NAME, AND I'LL NEVER FORGET IT. >> Reporter: THE ILLINOIS SHERIFF WHO HIRED AND FIRED THE DEPUTY CHARGED WITH MURDERING SONYA MASSEY IN HER SPRINGFIELD HOME NOW APOLOGIZING. >> I'M SORRY WE DID NOT DO OUR JOBS. >> YOU BETTER [ BLEEP ] I'LL SHOOT YOU RIGHT IN YOUR [ BLEEP ] FACE. >> Reporter: SANGAMON COUNTY SHERIFF JACK CAMPBELL SAYING THE DEPARTMENT FAILED THE 36-YEAR-OLD, BUT REFUSING CALLS TO RESIGN. >> I CANNOT STEP DOWN. THAT WOULD SOLVE NOTHING. THE INCIDENT WOULD REMAIN. I VOW TO LISTEN. >> Reporter: TONIGHT ATTORNEY GENERAL MERRICK GARLAND SAYING THE JUSTICE DEPARTMENT CIVIL RIGHTS DIVISION IS MONITORING THE CASE. >> SO I'VE SEEN THE VIDEO. IT IS HORRIFIC. >> Reporter: THIS AS RED FLAGS CONTINUE EMERGING ABOUT NOW FORMER DEPUTY SEAN GRAYSON WHO COURT RECORDS SHOW PLEADED GUILTY TO TWO DUIs IN 2015 AND 2016, THE FIRST PROMPTING HIS DISCHARGE FROM THE ARMY FOR SERIOUS MISCONDUCT. TWO SOURCES TELL NBC. GRAYSON LATER WENT INTO LAW ENFORCEMENT, WORKING FOR SIX DIFFERENT AGENCIES SINCE 2020. >> HOW ARE YOU STILL EMPLOYED BY US? >> I DON'T KNOW. >> Reporter: IN AUDIO RECORDINGS FROM NOVEMBER 2022 OBTAINED BY NBC NEWS, SUPERIOR OFFICERS AT GRAYSON'S LAST JOB IN LOGAN COUNTY APPEAR TO ADMONISH HIM FOLLOWING A HIGH-SPEED CHASE THAT DISCIPLINARY REPORTS SHOW VIOLATED DEPARTMENT POLICY, REACHING 110 MILES PER HOUR AND ENDED WITH HIM STRIKING A DEER. >> MISCONDUCT WILL LAND YOU IN JAIL. I'M CALLING YOU ON YOUR INTEGRITY. HOW DOES THAT MAKE YOU FEEL? >> LEARNING FROM IT. >> Reporter: RECORDS SHOW GRAYSON LEFT THAT JOB IN GOOD STANDING. HE PLEADED NOT GUILTY TO CHARGES RELATED TO MASSEY'S DEATH. HIS ATTORNEY DECLINING TO COMMENT AS TONIGHT MASSEY'S FAMILY SPEAKS OUT. >> I WOULD HAVE NEVER IN THE WORLD THOUGHT THE POLICE SHOT MY MOM. LIKE HOW? >> Reporter: MAGGIE VESPA, NBC NEWS, SPRINGFIELD, ILLINOIS. >>> ALSO TONIGHT, THEY CAN HELP SHED THE POUNDS, BUT CAN WEIGHT LOSS DRUGS ALSO PROTECT AGAINST ALZHEIMER'S DISEASE? NEW RESEARCH HAS FOUND A DRUG SIMILAR TO OZEMPIC APPEARS TO SLOW COGNITIVE DECLINE IN PEOPLE WITH MILD ALZHEIMER'S. RESEARCHERS SAY AFTER A YEAR, PATIENTS SHOWED AN 18% SLOWER DECLINE IN COGNITIVE ABILITY. >>> AND UP NEXT FROM PARIS, DOUBLES ARE USUALLY THEIR THING, BUT HERE FANS CAN'T GET ENOUGH OF THE DREAM TEAM BEING CALLED NADALCARAZ. ♪♪ ♪♪ >>> WE'RE BACK NOW FROM PARIS, WHERE THERE MAY BE FEW TICKETS HOTTER THAN TENNIS. THE DRAW? THE SPORT'S BIGGEST NAMES TAKING CENTER COURT AT ONE OF ITS MOST ICONIC VENUES. >> CARLOS ALCARAZ AND RAFAEL NADAL! >> CALL THEM SPAIN'S DREAM TEAM OR ALCARAZ AND NADAL. THIS IS A DREAM MATCH. DREAM PAIRING. >> NADALCARAZ. >> IS THAT WHAT THEY'RE CALLING IT? >> WE'VE ALREADY NICKNAMED THEM, YEAH. >> RAFAEL NADAL AND CARLOS ALCARAZ, TWO OF THE BEST TO EVER PLAY, TEAMING UP TO REPRESENT SPAIN IN DOUBLES HERE IN PARIS. THESE GUYS ARE REALLY AT OPPOSITE ENDS OF THEIR CAREER. >> THEY COULD NOT BE IN DIFFERENT PLACES IN THEIR CAREERS. ALCARAZ HAS ALREADY WON FOUR MAJORS ON THREE DIFFERENT SURFACES. NADAL IS 38 YEARS OLD, AND HE IS PLAYING OLD. HE HAS LOST HIS BAD SPEED. ALCARAZ IS EXACTLY WHAT HE NEEDS RIGHT NOW. >> THEIR MATCHES IN AN ICONIC PARIS VENUE. HISTORY AND STAR POWER COME TOGETHER HERE AT ROLAND-GARROS, THE TENNIS VENUE, WHERE THE BIGGEST NAMES IN THE SPORT ARE CONVERGING ON THE FAMOUS CLAY COURTS, HOME OF THE FRENCH OPEN. AND WHEN YOU PUT TWO OF THOSE TOP NAMES TOGETHER, YOU GET ONE OF THE HOTTEST TICKETS IN PARIS. WHAT ELSE DO YOU WANT TO SEE RIGHT HERE? >> I WANT TO SEE ALCARAZ AND NADAL PLAY DOUBLES TOGETHER. >> Reporter: BETWEEN THEM, THEY'VE WON 26 MAJORS, BUT THEY'VE NEVER PLAYED TOGETHER UNTIL NOW. >> WHAT A SPECTACULAR VOLLEY FROM NADAL! >> AS A PAIR, THEY REALLY HAVEN'T PLAYED MUCH TOGETHER. SO THEY'RE PLAYING MUCH MORE EXPERIENCE. >> ABSOLUTELY. ALCARAZ IS OUT THERE JOYOUSLY PLAYING WITH DELIGHT. HE DOESN'T REALLY KNOW HOW TO USE HIS GAME IN DOUBLES. AND YOU CAN SEE THAT NADAL IS TRYING TO CALM HIM DOWN A LITTLE BIT. HE'S A PUPPY. HE IS A LAMB IN SPRINGTIME. >> TODAY AN EXPERIENCED DUTCH TEAM GAVE NADAL AND ALCARAZ A RUN FOR THEIR MONEY, THEY PUT THEM AWAY IN A TIEBREAKER, MOVING ON TO THE QUARTERFINALS AND KEEPING THE DREAM OF NADALCARAZ ALIVE. >>> AND COMING UP, SHE WAS BULLIED AS A CHILD, AND FOUGHT ALL THE WAY TO THE PARIS OLYMPICS. JENNY LOZANO'S REMARKABLE STORY, NEXT. ♪♪ >>> BRAZILIAN SURFER GABRIEL MEDINA DEFYING GRAVITY AND AN EARLY CONTENDER FOR THE MOST ICONIC SHOT OF THE PARIS OLYMPICS. >>> AND FINALLY, SHE LEARNED TO BOX BATTLING BULLIES. NOW THE WOMAN THEY CALL THE TROUBLE MAKER IS FIGHTING FOR GOLD HERE IN PARIS. HERE IS TOM LLAMAS. >> LOZANO ENJOYS MAKING LIFE DIFFICULT FOR HER OPPONENTS IN THE RING. >> Reporter: YOU'RE WATCHING THE MOMENT AN OLYMPIC DREAM IS ABOUT TO COME TRUE. >> LOVELY RIGHT FROM LOZANO. >> Reporter: THERE IN BLUE, 21-YEAR-OLD JENNY LOZANO SLUGGING HER WAY TO PARIS. >> IT'S LOZANO WHO DOES IT BEST AND LOZANO WHO SCREAMS IN DELIGHT. >> Reporter: WHEN YOU QUALIFIED, WHAT WAS THAT MOMENT LIKE? >> THAT WAS SURREAL. >> LOZANO! >> SOMETHING I HAD DREAMT OF FOR SO LONG, FOR YEARS SINCE I WAS A KID. AND EVERYTHING I HAD TO GO THROUGH, JUST TO BE HERE. >> Reporter: A DREAM THAT BEGAN HERE IN THE BORDER TOWN OF LAREDO, TEXAS. AT JUST 9 YEARS OLD, SHE WALKED INTO THIS SMALL NEIGHBORHOOD GYM, LOOKING FOR HELP AFTER BEING BULLIED. >> I LOVED IT. I JUST FELL IN LOVE WITH THE FACT THAT I COULD PUNCH SOMETHING OR SOMEBODY AND I COULD DEFEND MYSELF. >> Reporter: SHE WAS OFTEN THE LONE FEMALE BOXER. WHEN PEOPLE TOLD YOU GIRLS WEREN'T SUPPOSED TO FIGHT, WHAT DID YOU TELL THEM? >> THAT I COULD. I JUST ACCEPT SAYING, LIKE, OH YOU SAY I CAN'T? OKAY, I'M GOING TO SHOW YOU I CAN. AND WHEN I WIN, I'M GOING TO LOOK AT YOU AND SAY LOOK, LOOK WHERE I AM. >> Reporter: AT JUST 12 YEARS OLD, SHE WON HER FIRST NATIONAL COMPETITION, LIVING UP TO THE NICKNAME HER GRANDMOTHER GAVE HER, LA TRAVIESA. IT MEANS TROUBLEMAKER. ARE YOU A TROUBLE MAKER IN THE RING? >> DEFINITELY. I TRY TO BE AS MUCH OF A TROUBLEMAKER AS I CAN. >> Reporter: IN A TOWN ALONG THE BORDER WHERE BOXING FACILITIES AND RESOURCES ARE OFTEN SCARCE, HER COACHES SAY JENNY'S POTENTIAL WAS LIMITLESS. YOU'RE THE FIRST OLYMPIAN FROM LAREDO. HOW DOES THAT MAKE YOU FEEL? >> LIKE I MADE IT! LIKE EVERY SINGLE OUNCE OF LITERAL BLOOD, SWEAT AND TEARS, EVERY SACRIFICE, THEY WERE ALL WORTH IT. >> Reporter: AND THERE ALWAYS IN THE STANDS, JENNY'S BIGGEST SUPPORTER, HER MOTHER. >> SHE IS A WORRIER. SHE IS A VERY GOOD DAUGHTER AND FRIEND AND EVERYTHING TO ME. >> Reporter: ALTHOUGH SHE NEVER CRIES IN THE RING, WE WERE THERE FOR THIS MOMENT. WHEN JENNY THANKED HER MOTHER FOR BEING IN HER CORNER AND REALIZING WHAT IT MEANS TO BE AN OLYMPIAN. >> I THINK ABOUT WHAT I REPRESENT, WHO I REPRESENT. AND THAT PUSHES ME TO KEEP GOING. AND I THINK ABOUT LITTLE ME TOO. I THINK ABOUT HOW I WISH I HAD SOMEONE LIKE ME, SOMEONE I COULD LOOK UP TO IN THE RIGHT WAY. >> Reporter: TOM LLAMAS, NBC NEWS, LAREDO, TEXAS. >>> AND THAT IS "NIGHTLY NEWS" FOR THIS TUESDAY. THANK YOU FOR WATCHING. I'M LESTER HOLT. PLEASE TAKE CARE OF YOURSELF AND EACH OTHER. GOOD NIGHT. GOOD NIGHT.