The House of Cards actor oohed and aahed from the stands on Day 2.
The tennis legend walked the red carpet on Day 2.
The fashion designer and Vogue editor posed with the singer on Day 1. "Had fun singing and sharing my story here at the US Open w a special group of people who have come together to help raise money for at risk youth," Jewel wrote on Instagram.
The top-seeded American beat Russian Ekaterina Makarova in a 6-3 6-3 victory on Day 2.
The Hamilton star and the living legend jammed at the USTA Foundation Gala on Day 1.
The Serbian sportsman defeated Poland's Jerzy Janowicz 6-3, 5-7, 6-2, 6-1 on Day 1. But, Djokovic called a medical timeout after the fifth game. "It was just prevention. It's all good. It's getting better and better each day," he said of his wrist injury. "Hopefully as the tournament progresses, I'll reach my peak."
The actors had the audience in stitches at the USTA Foundation Gala on Day 1. "Had a ball control-hosting th @USTA_Foundation with my pal @AlecBaldwin & to meet its Chairman @JRBlake," Messing tweeted.
The famous chef suited up for Day 1. "Happy to be a part of the #USOpenGala benefitting the @USTA_Foundation! #ServingUpDreams," Lagasse tweeted.
The couple attended the USTA Foundation Gala on Day 1. "The @usta_foundation gala is always an inspiring one where we come together to raise money to help provide children with brighter futures through tennis and education," Serhant wrote on Instagram. "My wife @emilia_bechrakis and I are proud supporters and honored to be in the presence of such brilliant minds, friends, role models and clients. Thank you to our dear friend and attorney Y. David Scharf for inspiring us to give back to the community!!!"