Roger Federer has advanced to the men's quarterfinals in the 2012 U.S. Open Championship after No. 23 Mardy Fish withdrew on Monday. Fish was set to play the No. 1 player in the world this afternoon, yet withdrew due to a recurring heart issue that popped up again following his win against Gilles Simon on Sunday.
Fish had missed time earlier this year due to heart problems, and pulled out of the Davis Cup before being hospitalized with heart arrhythmia. He underwent a procedue in May to correct the issue, with doctors stating he should be safe to continue playing without fear of his problems reoccurring.
Federer will face No. 6 seed Tomas Berdych, who defeated Spain's Nicolas Almagro on Monday. Berdych used 17 aces to take out Almagro, who struggled with unforced errors and faulted serves for most of the match.