Jack Sock (born September 24, 1992) is an American tennis player. The men's junior US Open champion in 2010, he is best known for winning the 2011 US Open mixed doubles title with fellow American Melanie Oudin.

Sock 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.

Sock played relatively infrequently on the junior circuit, however, entering just two further tournaments: the Dunlop Orange Bowl in 2009 and the junior singles at the 2010 U.S. Open. At this tournament, he received a wildcard entry, but proceeded to the final. There, he defeated fellow American Denis Kudla, 3–6, 6–2, 6–2, to become the first American winner of the junior championships since Andy Roddick in 2000. He won the Boy's Junior National Tennis Championship in 2010 and 2011, earning a wildcard in both years for the main draw of the US Open.

Bernard Tomic (Croatian: Bernard Tomić; born 21 October 1992) is an Australian professional tennis player. As of 24 October 2011, Tomic is the highest ranked Australian male tennis player and the youngest player in the top 219. The highlight of Tomic's career thus far has been a quarterfinal appearance at the 2011 Wimbledon Championships, which included a straight sets third round victory over the world Number 5 ranked player, Robin Söderling, before losing in four sets to eventual champion Novak Djokovic.

Tomic was born in Stuttgart, Germany, on 21 October 1992. Tomic's parents, John (Ivica) and Ady (Adisa), left Croatia, then a part of Yugoslavia, several years before his birth. In an interview, Tomic stated that his parents "have a Croatian background". Other sources, such The Australian and The Guardian, have written that Tomic's parents are also of Bosnian heritage. They were both working in Germany when Tomic was born. The family migrated to Queensland, Australia when Tomic was three years old. His younger sister, Sara, is a junior tennis player.