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.