Paul Annacone (born March 20, 1963) is an American former touring professional tennis player and current tennis coach. He is the former coach of 20-time Grand Slam winner Roger Federer, 14-time Grand Slam winner Pete Sampras, and 2017 US Open champion Sloane Stephens.Annacone is currently a coach at ProTennisCoach.com, a commentator at Tennis Channel, and works with Taylor Fritz.
https://en.wikipedia.org/wiki/Paul_Annacone