The second set was slipping away from Coco Gauff in the U.S. Open’s fourth round on Sunday, so maybe she was frustrated by that... or the stumble that left her doing the splits while getting broken... or the pair of double-faults that helped Caroline Wozniacki take that game.
Or perhaps it was simply that the last thing she wanted to hear at that moment was the near-constant chatter coming from Brad Gilbert, one of her two coaches sitting in the front row at Arthur Ashe Stadium.
