Tennis-U.S. Open men's singles round 4 results

Sept 2 (Infostrada Sports) - Results from the U.S. Open Men's Singles Round 4 matches on Monday 10-Kei Nishikori (Japan) beat 5-Milos Raonic (Canada) 4-6 7-6(4) 6-7(6) 7-5 6-4 8-Andy Murray (Britain) beat 9-Jo-Wilfried Tsonga (France) 7-5 7-5 6-4 1-Novak Djokovic (Serbia) beat 22-Philipp Kohlschreiber (Germany) 6-1 7-5 6-4 3-Stanislas Wawrinka (Switzerland) beat 16-Tommy Robredo (Spain) 7-5 4-6 7-6(7) 6-2