Jack Sock (born September 24, 1992) is an American professional tennis player who is currently the top ranked male American in singles and one of the top ranked doubles players on the ATP Tour. A former junior US Open champion, Sock's singles success is highlighted by 7 ATP finals, including three titles. His career best result came at the 2017 Indian Wells Masters, where he reached the semi-finals.Sock regularly played doubles with Canadian tennis player Vasek Pospisil until July 2016 and together they won the 2014 Wimbledon Grand Slam championship, a victory that helped vault them into the Top 10 of the ATP Doubles rankings. Additionally, he won the 2011 US Open mixed doubles title with fellow U.S. player Melanie Oudin. Wikipedia