Jack Sock (born September 24, 1992) is a professional tennis player who is currently one of the top ranked Americans in both singles and doubles on the ATP Tour. A former junior US Open champion, Sock's singles success is highlighted by 7 ATP finals, including three titles.

He regularly played doubles with Canadian tennis player Vasek Pospisil through July of 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.

At the 2016 Olympics, he won the gold medal in the mixed doubles with Bethanie Mattek-Sands and captured a bronze medal in the men's doubles with Steve Johnson.

Sock graduated from Blue Valley North High School in Overland Park, Kansas. He was 80–0 in his KSHSAA 6A high school tennis career, winning four consecutive state championships.

He had moved to Kansas from Nebraska at the age of 12 to train at the Mike Wolf Tennis Academy.

As a junior, Sock reached as high as No. 22 in the world combined rankings in October 2010. He played his first ITF junior tournament in October 2008, aged 16, at the Pan American Championships. In the 2009 US Open, his third junior tournament, he reached the semifinals of the junior doubles with Matthew Kandath, and the third round of the junior singles.

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