 To Wimbledon, 20-year-old Coco Gauff is through to the second round after a straight sets victory over fellow American Caroline Dolehide. Gauff declaring last year's U.S. Open win has given her game a boost. Yeah, I think in Grand Slam, it gives me a lot of confidence because I don't even think the U.S. Open was my best tennis the whole tournament. I had a lot of three set matches.