Sam Austin Querrey (born October 7, 1987) is a professional American tennis player from San Francisco, California currently living in Las Vegas, Nevada. His career-high singles ranking is world no. 17, achieved in January 2011. Querrey holds the record for most consecutive service aces since the ATP began keeping records of those statistics, with 10 in a 2007 match against James Blake. His regular doubles partner is fellow American John Isner.
Querrey turned down a scholarship offer from USC to turn pro. His father Mike Querrey recommended that his son try making it in tennis, as he often regretted his own decision to go to the University of Arizona rather than play baseball for the Detroit Tigers, who had drafted him. Querrey said that going pro was "one of the toughest decisions of my life. [...] I'd play a match and want to go pro. I'd lose and want to go to college."
On June 11, 2006, Querrey became the first player to win a challenger event in his pro debut. He won in the Yuba City and Winnetka challengers. He won his first-round match at the Indian Wells Masters tournament over Bobby Reynolds, before falling to James Blake in three sets. He defeated American Vince Spadea at the Countrywide Classic in Los Angeles. At the US Open, Querrey received a wildcard and defeated Philipp Kohlschreiber in straight sets, before falling to Gastón Gaudio in the second round.