Some of the world’s famous A-listers and celebrities gathered to watch some of the tennis matches at Flushing Meadows. This goes to show that not all the action is spotted on the court, but there’s plenty in the players’ boxes as well.

A number of celebrities were spotted during the quarterfinal match between five-time US Open champion Roger Federer and Richard Gasquet. Actors Alec Baldwin and Bradley Cooper enjoyed one hour and 27 minutes of high quality tennis on Arthur Ashe on Wednesday. Talk show host and TV personality Jimmy Fallon was also in attendance during the match. Fallon was joined by pal Justin Timberlake in the stands.

Michael J. Fox also watched the quarterfinal match with his wife Tracy Pollan. Business mogul John Paulson was also there to cheer for Federer and Gasquet’s match, which was the duo’s 17th meeting on tour.

Federer won the match against Gasquet 6-3 6-3 6-1, improving his head-to-head series advantage over the Frenchman 15-2. Federer will face Davis Cup teammate Stan Wawrinka in the semifinal as he continues his bid to win a sixth US Open trophy.

In one of the women’s quarterfinal match featuring Venus Williams and Serena Williams, who is bidding for to complete a Calendar Slam this season, presidential candidate Donald Trump was also spotted enjoying the match. Trump was joined by his wife, Melania.

Oprah Winfrey also had to be there to witness the Williams’ sisters clash on court. Serena knocked out Venus 6-2 1-6 6-3 to secure a semifinal berth, where she will face unseeded Roberta Vinci of Italy.

In previous matches, the cameras spotted Jamie Foxx watching one of Novak Djokovic’s matches. Golf star Tiger Woods was also seed in Rafael Nadal’s box.

Ben Stiller and wife Christine Taylor were also seen at the US Open. The couple was with their daughter Ella Olivia, reported Page Six.

Only eight players (four male and four female) are left on the draw. The semifinal matches for the men’s singles and women’s singles event will take place on Sept. 11 (EDT) on Arthur Ashe Stadium. The first match features Simona Halep and Flavia Pennetta followed by Serena and Vinci.

The first men’s singles semifinal match will be between Novak Djokovic and defending champion Marin Cilic. Federer and Wawrinka’s all-Swiss semifinal match follows next.

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Bradley Cooper
Actor Bradley Cooper (L) attends the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015. REUTERS/Carlo Allegri REUTERS/Carlo Allegri
Michael J. Fox
Actor Michael J. Fox and his wife Tracy Pollan attend the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015. REUTERS/Carlo Allegri Reuters/Carlo Allegri
Alec Baldwin
Actor Alec Baldwin attends the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015. REUTERS/Carlo Allegri REUTERS/Carlo Allegri
Oprah Winfrey
Television personality Oprah Winfrey (L) watches as Serena Williams of the U.S. plays against her sister and compatriot Venus Williams in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015. Reuters/Carlo Allegri
John Paulson
Billionaire hedge fund manager John Paulson, who leads Paulson and Co., attends the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015. REUTERS/Carlo Allegri REUTERS/Carlo Allegri
Jimmy Fallon and Justin Timberlake
Television personality Jimmy Fallon (L) and actor and singer Justin Timberlake play around as they are shown on a video screen as they attend the quarterfinals match between Roger Federer of Switzerland and Richard Gasquet of France at the U.S. Open Championships tennis tournament in New York, September 9, 2015. REUTERS/Carlo Allegri REUTERS/Carlo Allegr
Donald Trump
U.S. Republican presidential candidate Donald Trump (2nd from L) watches with his wife Melania as Serena Williams of the U.S. plays against her sister and compatriot Venus Williams in their quarterfinals match at the U.S. Open Championships tennis tournament in New York, September 8, 2015. REUTERS/Lucas Jackson REUTERS/Lucas Jackson