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Good thing Nadal won: Leonardo DiCaprio finds himself seated near Queen Sofia of Spain (not pictured) during the men's final.
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IT'S A DATE!
Leaving baby Carmen at home, new parents Alec and Hilaria Baldwin snuggle up on Sept. 9.
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Call it a triple: Kaley Cuoco and beau Ryan Sweeting – who happens to be a tennis player – find "love" Sept. 9 at the Open.
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WHAT A SHOT
Click! Jessica Alba loses a bit of focus on the action to snap a stylish selfie on Sept. 9.
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True Blood's Alexander Skarsgard, hanging with director Baz Luhrmann, brings some sex appeal to the game on Sept. 9.
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BEHIND THE SCENES
The day's big winner gets some big kudos from Eva Longoria and Ricky Martin after the on-court excitement.
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Meanwhile, Serena's big sis Venus (and some excited fans!) gets some words of wisdom from former President Bill Clinton, who was also on hand for the Sept. 8 match.
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FULL OF CHEER
It's a win! The Big Bang Theory's Jim Parsons finds himself to be the main attraction during a break in play on Sept. 8.
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EASY ON THE EYES
Miranda Kerr gets her game face going on Sept. 8, watching the daytime action with a gal pal.
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After hanging with Tommy Lee Jones, Sean Connery finds a new friend in the stands, taking in the Rafael Nadal vs. Richard Gasquet match with Ben Stiller and wife Christine Taylor (not pictured) on Sept. 7.
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Sports Illustrated cover girl Kate Upton covers up on Sept. 7 to catch a few matches from the Moët amp Chandon suite.
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Guess you had to be there! Dylan McDermott and a female friend don't take the game too seriously on Sept. 7.
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She's made in the shade! Julianna Margulies stays safe in the sun on Sept. 7 while watching the daytime action with a color-coordinated pal.
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Sporting a cute, tennis-worthy top, Downton Abbey's Michelle Dockery and rumored beau John Dineen stay tuned in as Serena Williams bests Na Li on Sept. 6.
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BUMP IN THE ROAD
Though they lost to pros Chris Evert and Monica Seles, actors Jason Biggs and Rainn Wilson still have plenty of pride while pumping each other up during a Sept. 5 exhibition doubles match.
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THE SUITE LIFE
Tiffani Thiessen and Molly Sims put their heads together on Sept. 5 while taking a break from the action (and their husbands).
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New parents Jenna Bush and husband Henry Hager enjoy a date night on Sept. 5, watching top player Novak Djokovic defeat Russia's Mikhail Youzhny in four sets.
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The crowd goes wild on Sept. 5 as big players from the big screen – Sean Connery and Tommy Lee Jones – take in the Djokovic vs. Youzhny match.
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With a huge smile on her face, newly engaged Katie Couric gets a squeeze from fiancé John Molner (and debuts her stunning engagement ring!) during the Sept. 4 evening play.
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Not impressed by the action, guys? Donald Trump and wife Melania Trump stay straight-faced while watching Rafael Nadal best fellow Spaniard Tommy Robredo on Sept. 4.
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ALL IN GOOD FUN
Dakota Fanning excitedly looks on during the Sept. 4 evening matches, sitting hand-in-hand with a mystery man.
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TIP OF THE HAT
Live with Kelly and Michael's Michael Strahan enjoys his moment in the jumbo screen spotlight on Sept. 4, where he watched the Nadal match courtside.
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Nick Jonas finds himself a bit distracted on Sept. 3, catching the daytime action with his lucky lady friend, Miss Universe Olivia Culpo, in the Lacoste suite.
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UNDER THE RADAR
Who's that shady tennis fan? It's Leonardo DiCaprio, who joins actor pal Lukas Haas at the Sept. 3 evening men's match, which Brit favorite Andy Murray won.
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ARM-Y OF ONE
David Schwimmer finds a tennis-watching Friend in wife Zoe Buckman, who sticks by her husband's side while watching Serena Williams defeat Spain's Carla Suarez Navarro on Sept. 3.
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Carson Kressley accessorizes his tennis look with a gold glass of bubbly on Sept. 3 in the Moët amp Chandon suite.
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WHAT A 'STAR'
Someone just spotted herself on the big screen! Star Jones revels in her star moment during the Sept. 3 matches.
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Leaving her sisters at home, Elizabeth Olsen steps out for a casual Labor Day at the USTA Tennis Center.
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Also enjoying a Girls day out at the Open: Zosia Mamet, who leaves her mark on a bottle of bubbly in the Moët amp Chandon suite on Sept. 2.
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Homeland's Sam Underwood takes a glass of champagne to go on Sept. 2 before catching the action on the court.
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UP IN ARMS
She's a serious fan! Crossing Jordan's Jill Hennessy can't help but get excited while watching American Alison Riske play (but eventually lose in three sets to Daniela Hantuchova) during a Sept. 2 match.
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SHORT & SWEET
Christine Taylor gives hubby Ben Stiller a "love"-ing look on Sunday while watching Serena Williams beat Sloane Stephens in a two-set match.
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SNAP TO IT
Also at the Williams vs. Stephens match: Dr. Oz, who takes a few photos (and tweets them, too!) on Sunday.
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Kelsey Grammer, wife Kayte and repeat attendee Kevin Spacey sit back and enjoy the Sunday action together.
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SATURDAY NIGHT VIEW
Ashley Greene and former Downton Abbey star Dan Stevens have their eyes on the ball (alongside Josh Groban, top right) Aug. 31 inside Arthur Ashe Stadium. Fun fact: Stevens once had a starring voice in the 2008 BBC radio play The Tennis Court, a WWII drama that brought the war to the green.
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IN THE SPOTLIGHT
Singer Josh Groban and retired player-turned-Tennis Channel commentator Justin Gimelstob steal a moment from the court Aug. 31. Not that Groban minded: "They showed me on the jumbo tron at the #usopen," he tweeted. "I'd like to be the official face of point challenges. #grobotron."
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Winona Ryder gives a hand to Kevin Spacey on Day 6 of the U.S. Open. Of course, it wasn't Spacey's first day: He was there for opening night.
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DADS' NIGHT OUT
Spike Lee and Ralph Macchio turn Saturday night tennis into a father-son event with boys Jackson Lee and Daniel Macchio (yes, his name was partly inspired by Karate Kid).
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Smash costars Debra Messing and Megan Hilty kick off Friday night at the U.S. Open, where both No. 1 Serena Williams and Aussie Lleyton Hewitt advanced to the next round. "UNBELIEVABLE!!!" Messing later tweeted. "HEWITT DEFEATS DEL POTRO !!!!!! truly amazing match at the US Open! Thrilling!"
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MAKING IT BIG
Look who made the jumbo screen! Debra Messing makes a point of sharing the moment with Smash costar Megan Hilty and her beau Brian Gallagher during the Hewitt-Del Potro match.
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Daily Show funny guys John Oliver and Wyatt Cenac are live at the scene in some serious shades and hats to catch the day's plays Aug. 30.
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MAN IN THE STANDS
Josh Lucas takes the game seriously on Aug. 29, keeping both eyes on the court during the evening events.
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FRONT & CENTER
30 Rock's Katrina Bowden and new husband Ben Jorgensen have a front-row seat to the evening action while kicking back on Aug. 29.
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TWO OF A KIND
Also at the Open on Aug. 29: former WNBA star Lisa Leslie-Lockwood and Good Morning America's Lara Spencer, who stick together during a daytime match.
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30 Rock's Katrina Bowden adds her name to one very big bottle on Aug. 29 inside the U.S. Open's chic Moët amp Chandon suite.
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Tony Bennett puts on his happy face on Aug. 29 while taking in the nighttime matches with wife Susan by his side.
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LAUGH IT OFF
Kim Sears can't keep a straight face on Aug. 28 as she watches her boyfriend, Great Britain's Andy Murray, beat France's Michael Llodra during an evening match.
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Why the face, Olivia? Munn puts on her best game face on Aug. 28 while sitting courtside as Argentina's Juan Martin Del Potro defeats Spain's Guillermo Garcia-Lopez.
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Model Dree Hemingway puts pen to paper, er, champagne bottle on Aug. 28 inside the Moët amp Chandon Suite at the Billie Jean King National Tennis Center.
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SEAL OF APPROVAL
It's a thumbs-up from TV host Sean Hannity on Aug. 28 as he happily watches the action live in Flushing, Queens.
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What's so funny? Katie Couric and banker beau John Molner happily take in the action on the main court Aug. 27.
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Model Selita Ebanks brings a little flower power to the Open on Aug. 27, sporting a pretty patterned blazer and skinny jeans while arriving at the USTA Billie Jean King National Tennis Center to watch No. 1 player Novak Djokovic defeat Ricardis Berankis. Check out her view from the stands here.
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From the links to the courts! Pro golfer Rory McIlroy looks on as girlfriend Caroline Wozniacki beats Ying-Ying Duan on Aug. 27.
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DRINKING IT IN
Actress Dakota Johnson proposes a toast to the Aug. 27 matches from the Moët amp Chandon press room.
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SILLY IN THE STANDS
Kiss cam? More like kidding cam! Jason Sudeikis and fiancée Olivia Wilde goof off in the Emirates Suite on opening night, Aug. 26, while taking in a match between Serena Williams and Francesca Schiavone, which Williams won.
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WHY SO SERIOUS?
Also at the Williams vs. Schiavone match: a dressed-up Kevin Spacey, who takes in the action with an amused pal.
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Tennis rocks, thanks to a performance by Lenny Kravitz, who kicks off the U.S. Open with a bang during a fireworks-filled opening ceremony concert.
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While some stars hang in the stadium, Robin Roberts – who told reporters she recently hit the court for the first time since recovering from myelodysplastic syndrome – leads the charge into the 13th annual USTA Serves Opening Night Gala on the Billie Jean King National Tennis Center grounds.
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DRESSED TO A T
Off the ice, onto the court? Olympic ice skater Johnny Weir dresses in his trendy tennis whites (love the bag!) for the USTA bash.
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BACK IN ACTION
Cuba Gooding Jr. also joins in the fun at the USTA gala, which raised funds for USTA Serves, an organization that puts at-risk children and children with disabilities into tennis programming.
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GIRLS' DAY OUT
First Lady Michelle Obama, joined by daughters Malia, 15, and Sasha, 12, takes in the action Aug. 24 at Arthur Ashe Kids' Day at New York's National Tennis Center, where she appeared to promote her Let's Move campaign.
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IT'S A HIT
Causing a "racquet" at Arthur Ashe Kids' Day? The boys of The Wanted, who show off their tennis skills (or lack thereof) on the court.
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Also at Kids' Day: "The Way" singer Ariana Grande, who is rumored to be dating The Wanted's Nathan Sykes.
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Hitting the court for a little fun before the real competition begins, Rafael Nadal, Serena Williams and Roger Federer get in on the action at Kids' Day.
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ALREADY A WINNER
Guess college classes haven't started yet! Olympian Missy Franklin greets fans at Kids' Day, en route to school at University of California, Berkeley.
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Dressed in their finest tennis wear, Rosario Dawson, White Collar star Matt Bomer and Molly Sims celebrate the start of the tournament on Aug. 22 at the 2013 Heineken U.S. Open Kick-Off Party at PH-D inside the Dream Downtown hotel in N.Y.C.
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Reigning U.S. Open women's champ Serena Williams gets a little warm-up during a celebrity table tennis tournament Aug. 21 in N.Y.C.'s Madison Square Park. "I feel completely recharged," she told reporters recently. "I feel fine. To play more matches now later in my career than sooner, it’s interesting how good I feel."
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Looking fly, Venus! Serena's big sis keeps herself in tennis-ready shape on Aug. 21 during a spin class at New York's Flywheel Sports promoting her EleVen clothing line.
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TOAST WITH THE MOST
Cheers to that! Moët amp Chandon spokesman Roger Federer raises a bottle to the brand on Aug. 20 at a bubbly-filled bash inside New York's Chelsea Piers.
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Also toasting the Open: Josh Lucas and former 30 Rock star Katrina Bowden.
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ON RED ALERT
Novak Djokovic – the top player in the world – tries his hand at modeling during a Uniqlo event on New York's Fifth Avenue on Aug. 19 – but his heart was on the court.
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HAVING A BALL
Wimbledon champ Andy Murray kids around Aug. 19 at an N.Y.C. press conference announcing his participation in 2014's BNP Paribas Showdown tennis exhibition.
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Wild and Big Little Lies Costars Reese Witherspoon and Laura Dern Reunite for a Girls' Lunch
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