Jo - Wilfried Tsonga pulled out of U.S. Open in second round . U.S. hopes were boosted by a superb win by 23rd seed Mardy Fish over Russian Nikolay Davydenko . Fifth seed from France beaten by Slovakia 's Martin Fischer . Fischer was in Andy Murray 's half of the draw . Roger Federer playing later Thursday in afternoon session .
Jo - Wilfried Tsonga pulled out of U.S. Open in second round . Fifth seed from France beaten by Slovakia 's Martin Fischer . Fischer was in Andy Murray 's half of the draw . Roger Federer playing later Thursday in afternoon session .