Tennis stars rallied all over New York City after the US Open kicked off last week.

Last Wednesday, four-time Grand Slam champion Naomi Osaka attended an intimate gathering at 1 Hotel Brooklyn Bridge.

Also there was New York Times bestselling author and Peloton instructor Tunde Oyeneyin.

The next evening, Osaka battled Gayle King in a game of ping pong at the Fourth Annual Petit Slam at the Baccarat Hotel New York.

“Refereed by Boardroom co-founder and CEO Rich Kleiman, the match was played over the hotel’s Baccarat crystal-clad table, with Osaka ultimately taking home the win,” a source shared.

That same night, tennis superstar Serena Williams hit Lotte New York Palace for its ninth annual Palace Invitational pickleball tournament.

She was joined by Taylor Fritz, Matteo Berrettini and Caroline Wozniacki.

Over at the Waldorf Astoria New York, Andy Roddick emceed the first annual Waldorf Astoria Racquet Club: Ballroom Tennis Invitational, located inside the hotel’s Grand Ballroom.

Sam Querrey served as umpire and commentator, with notable players including Tommy Paul, Ben Shelton, Leylah Fernandez and Maria Sakkari. Other famous names in the room included Anna Wintour, Matt Friend, Daniel Boulud and Gracie Cashman.

We’re told guests sipped Moët & Chandon while enjoying culinary and cocktail creations from Chef Michael Anthony’s Lex Yard.

Last Friday, Venus Williams was spotted at Flyfish Members Club for Taste of Tennis, the VIP tennis, culinary and lifestyle event series in partnership with VCR Group.

“The intimate celebration was hosted by comedian and actor Matt Friend and included appearances by top players, exceptional food and partner activations throughout the night,” a source said.

Other attendees included Fritz, Berrettini, Wozniacki, Brandon Nakashima, Karolina Muchová, Genie Bouchard and Tomás Etcheverry, as well as VCR Group CEO David Rodolitz and AYS Sports Marketing’s Penny Lerner.

“Guests danced the night away with music from Scram Jones and Kristina Korobova,” a source said, adding that the event had a “discreet omakase counter.”

Meanwhile, last Saturday, Bebe Rexha celebrated her 37th birthday with dinner at TAO, followed by a party at Loosie’s Nightclub.

“The singer was welcomed with a birthday marquee and bottles of Grey Goose and Casamigos Reposado as the crowd cheered her arrival,” a spy told Page Six.

We’re told the “I’m Good (Blue)” singer jumped on the mic to hype up the crowd as the DJ played several of her hits.

We hear she danced the night away, making her exit around 2 a.m.