Venus Williams failed to convert a match point and lost in the fourth round of the U.S. Open to a player a dozen years younger than her, 10th-seeded Karolina Pliskova of the Czech Republic. Pliskova reached the first Grand Slam quarterfinal of her career by coming back to edge seven-time major champion Williams 4-6, 6-4, 7-6 (3) on Monday in Arthur Ashe Stadium.
Simona Halep made the quarterfinals at the U.S. Open for the second straight year, beating Carla Suarez Navarro in straight sets. The fifth-seeded Romanian won 6-2, 7-5 on Monday. She could face No. 1 Serena Williams next. The 22-time major champ plays Yaroslava Shvedova later in the day. Suarez Navarro, seeded 11th, was seeking the sixth Grand Slam quarterfinal of her career.
Juan Martin del Potro is back in the U.S. Open quarterfinals after Dominic Thiem retired in the second set of their match. The eighth-seeded Thiem took a medical timeout to have trainers look at his right knee after the set’s fifth game. He returned to the court for one point before deciding he couldn’t go on. Del Potro had won the first set 6-3 and was up a break in the second. Thiem, who turned 23 on Saturday, has had a breakthrough year, reaching the French Open semifinals and cracking the top 10. But the long season was starting to wear on his body.