Flavia Pennetta staved off four set points to close her match against Peng Shuai and reach the U.S. Open quarterfinals. The 26th-seeded Italian won 6-4, 7-6 (6) on Sunday. After failing to serve out the match, Pennetta was down 5-0 and 6-2 in the second-set tiebreaker and appeared to be struggling with the heat. More...