NEW YORK (AP) -- A look at Monday's play at the $38.3 million U.S. Open tennis championships:
WEATHER: Mix of sun and clouds, warm and humid. High of 87.
ATTENDANCE: Day: 38,129. Night: 24,674. Total: 62,803.
MEN'S RESULTS (Fourth Round): No. 1 Novak Djokovic defeated No. 22 Philipp Kohlschreiber in straight sets; No. 3 Stan Wawrinka beat No. 16 Tommy Robredo 7-5, 4-6, 7-6 (7), 6-2; No. 10 Kei Nishikori outlasted No. 5 Milos Raonic 4-6, 7-6 (4), 6-7 (6), 7-5, 6-4 in 4 hours, 19 minutes; No. 8 Andy Murray beat No. 9 Jo-Wilfried Tsonga 7-5, 7-5, 6-4.
WOMEN'S RESULTS (Fourth Round): No. 1 Serena Williams beat Kaia Kanepi 6-3, 6-3; No. 17 Ekaterina Makarova defeated No. 7 Eugenie Bouchard 7-6 (2), 6-4; No. 11 Flavia Pennetta beat No. 29 Casey Dellacqua 7-5, 6-2; No. 16 Victoria Azarenka defeated qualifier Aleksandra Krunic 4-6, 6-4, 6-4.
TOP PLAYERS ON COURT TUESDAY: Men's Fourth Round: No. 2 Roger Federer vs. No. 17 Roberto Bautista Agut, No. 6 Tomas Berdych vs. Dominic Thiem, No. 7 Grigor Dimitrov vs. No. 20 Gael Monfils, No. 14 Marin Cilic vs. No. 26 Gilles Simon; Women's Quarterfinals: No. 10 Caroline Wozniacki vs. No. 13 Sara Errani, Belinda Bencic vs. Peng Shuai.
STAT OF THE DAY: 2:26 a.m. - The finish time of the Nishikori-Raonic match, which equaled the latest finish in U.S. Open history.
QUOTE OF THE DAY: ''You cannot invent something. I mean, you just have to play your tennis. Of course, she's better than me, but if I still believe I can beat her, maybe if she doesn't have a good day, I can do that.'' - Flavia Pennetta, on her quarterfinal matchup against Serena Williams.
TUESDAY ON TV (All Times EDT): ESPN, 11 a.m.-11 p.m.; Tennis Channel, 11 a.m.-7 p.m.
ON THIS DATE (Sept. 2, 1924): Bill Tilden wins his fifth straight singles title, defeating Bill Johnston in straight sets.