A quick look at the U.S. Open :
LOOKAHEAD TO WEDNESDAY
For the sixth time, Roger Federer and Rafael Nadal are each a victory away from finally meeting at the U.S. Open, the only Grand Slam tournament where the rivals have never played each other. Juan Martin del Potro prevented it once and can do it again. Federer plays del Potro in the men's quarterfinals, and top-seeded Nadal faces 19-year-old Russian Andrey Rublev. Del Potro beat Nadal in the 2009 semifinals at Flushing Meadows, then ended Federer's five-year championship reign by upsetting him in the final. Federer will be the fresher player in their night matchup, having beaten Philipp Kohlschreiber in straight sets Monday, while the 24th-seeded del Potro was overcoming illness and a two-set deficit to rally past No. 6 seed Dominic Thiem in more than 3 1/2 hours. In the women's quarterfinals, No. 1 Karolina Pliskova of the Czech Republic faces No. 20 CoCo Vandeweghe of the U.S., and 15th-seeded Madison Keys of the U.S. meets 418th-ranked Kaia Kanepi of Estonia, the first qualifier in the U.S. Open women's quarterfinals since Barbara Gerken in 1981.
Rain. High of 73 degrees (23 Celsius)
Sunny. High of 82 degrees (28 Celsius).
Men's quarterfinals: No. 12 Pablo Carreno Busta beat No. 29 Diego Schwartzman 6-4, 6-4, 6-2; No. 28 Kevin Anderson beat No. 17 Sam Querrey 7-6 (5), 6-7 (9), 6-3, 7-6 (7).
Women's quarterfinals: No. 9 Venus Williams beat No. 13 Petra Kvitova 6-3, 3-6, 7-6 (2); Sloane Stephens beat No. 16 Anastasija Sevastova 6-3, 3-6, 7-6 (4).
STAT OF THE DAY I
37 - Venus Williams' age, making her the oldest women's semifinalist at the U.S. Open in the Open era, which began in 1968.
STAT OF THE DAY II
0 - Number of sets lost by Pablo Carreno Busta through the quarterfinals. No man has won the U.S. Open without dropping a set in the Open era, which started in 1968.
QUOTE OF THE DAY
''When I started my comeback at Wimbledon, I could have never even dreamed of something like this happening, having these results.'' - Sloane Stephens, who had foot surgery in January and returned to the tour in July. She reached her first Grand Slam semifinal since 2013.
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