Tennis champ Coco Gauff likes to get all dolled up now and again - except when she hits the court. "In tennis, if you wanna wear makeup, you can wear makeup," Gauff, 21, said in a Wednesday, August 27, interview with Vogue. "I know Serena [Williams] has worn eyeliner. I think Venus [Williams] still does the eyeliner. You can wear a full beat if you want to." Gauff, however, has a specific reason for going au natural during tennis matches and championships. "I just sweat too much and, like, makeup would be all over," she explained. "I know the WNBA girlies kill it down with the beats.