Tennis

The Latest: Thiem retires, del Potro into US Open quarters

Published Sep. 5, 2016 2:05 p.m. ET

foxsports

NEW YORK (AP) The Latest on the U.S. Open (all times local):

1 p.m.

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.

Del Potro knows all about that. The 2009 U.S. Open champ missed the tournament the last two years after surgeries on his left wrist.

But his stunning run to the Olympic silver medal signaled he's a contender again.

Del Potro got a huge break Monday when he spent only 72 minutes on court. He's played just 10-plus sets through four rounds.

At No. 142, del Potro is the lowest-ranked U.S. Open quarterfinalist since Jimmy Connors in 1991.

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11 a.m.

Juan Martin del Potro, Andy Murray and the Williams sisters are among those seeking to book their spots in the quarterfinals on Labor Day Monday at the U.S. Open.

Del Potro, the 2009 champ who has won over fans with his comeback from left wrist surgeries, takes on eighth-seeded Dominic Thiem, who broke into the top 10 this year after reaching the French Open semifinals.

The No. 2-seeded Murray, who is hoping to add Flushing Meadows to his Wimbledon and Olympic titles this year, takes on 22-seeded Grigor Dimitrov. And third-seeded Stan Wawrinka, who saved a match point in a five-set win Saturday, faces Illya Marchenko.

Among the women's highlights are back-to-back afternoon matches on Ashe with the Williams sisters. Sixth-seeded Venus is on first against 10th-seeded Karolina Pliskova, who is in the round of 16 at a major for the first time. Then top-seeded Serena meets 52nd-ranked Yaroslava Shvedova.

Fourth-seeded Agnieszka Radwanska is in the nightcap on Ashe, taking on 92nd-ranked Ana Konjuh.

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