Sam Austin Querrey (born October 7, 1987 in San Francisco, California, United States) is a professional American tennis player from Thousand Oaks, California currently living in Santa Monica, California. As of September 2009, he is the third-highest ranked American. His career high rank was #22, achieved on August 31, 2009. His height allows him to play with a strong serve and forehand. Querrey holds the record for most consecutive service aces since the ATP began keeping records of those statistics, with ten.

Querrey enjoys support from a group of fans known as The Samurai. The group hails back to Querrey's hometown of Thousand Oaks, and is seen at many tournaments.

"The Samurais are all my best friends from high school, and it started at the LA Open a few years ago. They paint their chests and go crazy and wear fun outfits and bring instruments into the stadium. They're the ultimate fan support group."