Querrey will usurp world No. 15 John Isner as the top American maletennisplayer after a 7-6 (7-5) 6-7 (7-9) 7-5 defeat of Australian 23rd seed Marinko Matosevic earned him a last-16 place.
The 31-year-old Federer has done it all in the world of tennis, winning more grand slam titles than any other maleplayer in history and spending a record number of weeks at the top of the world rankings.
Though likely not an attempt to be overtly jingoistic, the lack of a top American maleplayer who consistently challenges for titles has hurt the level of corporate support in tennis.