A quick look at the U.S. Open :
LOOKAHEAD TO MONDAY
The remainder of the men's and women's quarterfinals will be set. Rafael Nadal and Roger Federer play their fourth-round matches, and another former champion is in action in a match where he considers himself the underdog: No. 24 Juan Martin del Potro, who won the 2009 title when he beat Nadal and Federer back-to-back, faces No. 6 seed Dominic Thiem. ''He's having a great season already. He's the favorite for the match. But I like to play him,'' del Potro said. Federer will play the winner of that match if he can beat No. 33 Philipp Kohlschreiber, while the top-seeded Nadal goes against unseeded Alexandr Dolgopolov. On the women's side, top-seeded Karolina Pliskova and No. 4 Elina Svitolina both face American opponents. Pliskova opens play in Arthur Ashe Stadium against unseeded Jennifer Brady, while Svitolina takes on No. 15 Madison Keys in a night match.
Partly cloudy. High of 71 degrees (22 Celsius).
Sunny. High of 80 degrees (27 Celsius).
Men's fourth round: No. 12 Pablo Carreno Busta beat Denis Shapovalov 7-6 (2), 7-6 (4), 7-6 (3); No. 17 Sam Querrey beat No. 23 Mischa Zverev 6-2, 6-2, 6-1; No. 29 Diego Schwartzman beat No. 16 Lucas Pouille 7-6 (3), 7-5, 2-6, 6-2; No. 28 Kevin Anderson beat Paolo Lorenzi 6-4, 6-3, 6-7 (4), 6-4.
Women's fourth round: No. 13 Petra Kvitova beat No. 3 Garbine Muguruza 7-6 (3), 6-3; No. 9 Venus Williams beat Carla Suarez Navarro 6-3, 3-6, 6-1; No. 16 Anastasija Sevastova beat Maria Sharapova 5-7, 6-4, 6-2; Sloane Stephens beat No. 30 Julia Goerges 6-3, 3-6, 6-1.
STAT OF THE DAY
5-foot-7 - The height of No. 29 seed Diego Schwartzman, making him the shortest Grand Slam quarterfinalist since Jaime Yzaga, also 5-7, at the 1994 U.S. Open, according to the ATP.
QUOTE OF THE DAY
''I'm accepting all major credit cards and unforced errors.'' - Venus Williams.
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