Sam Querrey reacts after defeating Kevin Anderson, of South Africa, during the Citi Open tennis tournament on Friday, Aug. 3, 2012, in Washington. (AP Photo/Evan Vucci)

Photo by: Evan Vucci

Sam Querrey reacts after defeating Kevin Anderson, of South Africa, during the Citi Open tennis tournament on Friday, Aug. 3, 2012, in Washington. (AP Photo/Evan Vucci)