He defeated American Vince Spadea at the Countrywide Classic in Los Angeles. At the 2006 US Open, Querrey received a wildcard and defeated Philipp Kohlschreiber in straight sets, before falling to Gastón Gaudio in the second round.
In the Countrywide Classic in Los Angeles, he won against American Vince Spadea.  At the 2006 US Open, Querrey was given a wildcard and beat Philipp Kohlschreiber in straight sets, but then lost to Gastón Gaudio in the second round.