Jack Sock (born September 24, 1992) is an American professional tennis player. Together with Vasek Pospisil they won the 2014 Wimbledon 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 as well as the 2018 Wimbledon and 2018 US Open men's doubles titles with Mike Bryan. Following his US Open win, Sock reached a career-high doubles ranking of No. 2 in the world, behind Mike Bryan. He has won four career ATP singles titles and fourteen doubles titles.
Sock is currently ranked world No. 167 in men's singles as of May 20, 2019, and reached his career-high singles ranking of world No. 8 on November 20, 2017. He is the twelfth-ranked American in singles and one of the top-ranked Americans in doubles on the ATP Tour. A former junior US Open champion, Sock's singles success is highlighted by his title at the 2017 Paris Masters tournament and an appearance in the semifinals at the 2017 ATP Finals.