John Mulaney and Olivia Munn were on hand to see Coco Gauff in action at the 2025 US Open, and they were hooked on every minute of the match. The two were spotted hand in hand on their way into the Billie Jean King National Tennis Center in Queens on Tuesday, August 26, and the couple was all smiles - until the match started, when they both appeared tense as Gauff, 21, struggled to a win over Ajla Tomljanovic. Mulaney, 43, and Munn, 45, received rousing ovations when their faces appeared on the stadium scoreboard during the first-round showdown.