Coco Gauff welled up with tears early in her second-round match against Donna Vekić on Thursday night under the Arthur Ashe Stadium lights. 

After double faulting to concede her service at 4-4 in the first set, cameras caught Gauff getting teary-eyed during the changeover.

She buried her head in her towel at one point. 

Gauff’s serve has been a hot top of conversation at this year’s tournament, after she hired a new coach in Gavin MacMillan just days before it started. 

MacMillan, a biomechanics specialist, was brought into help Gauff’s serve specifically.