Before @rogerfederer and @delpotrojuan face off in the quarterfinals, tune in to #USOpen Facebook.com/usopentennis on Wednesday, Sept. 6 at 6:30am ET for a replay of their classic 2009 final. Tell us if you're #TeamFederer or #TeamDelPo! *Note: Access to watch the replay of this match is subject to territory availability #rogerfederer #juanmartindelpotro #grandslam #federer #delpotro #nyc #protennis #instatennis