Arm injury forces Wozniacki from Citi Open match

1:20 AM ET

WASHINGTON — Former No. 1 Caroline Wozniacki retired from her second-round match at the Citi Open against Sam Stosur because of an injured left arm.

The right-handed Wozniacki said that she felt pain while hitting a two-handed backhand at 5-all in the first set of a match that began Wednesday night and ended just past midnight on Thursday. She was treated by a trainer and wound up winning that set 7-5, but stopped playing after getting broken to trail 4-3 in the second.

“There was a point where I hit a backhand and I just felt it, and I was like ‘Oh, it’s nothing,”’ Wozniacki said. “But then I hit another backhand and I was like, ‘OK, it’s something.’ And it just got worse.”

It’s the latest in a series of setbacks this season for Wozniacki, the U.S. Open runner-up in 2009 and 2014.

She hasn’t won a Grand Slam match this year, losing in the first round at the Australian Open and Wimbledon and missing the French Open because of an injured ankle.

“At this point, I just can’t catch a break. I’m thinking, ‘I’m going to catch a break sooner or later.’ But right now, it’s just like one thing after the other,” Wozniacki said. “I feel like I’m hitting it pretty well. I’m serving well. And it’s like, this happens. It’s just like really disappointing.”

A left arm injury is the latest in a series of setbacks this season for Caroline Wozniacki. She missed the French Open because of an injured ankle and lost in the first round at the Australian Open and Wimbledon. Geoff Burke/USA TODAY Sports

Wozniacki is supposed to represent Denmark at the Rio de Janeiro Olympics next month and carry her country’s flag in the opening ceremony. She won an appeal to the International Tennis Federation to allow her to compete at the Rio Games after she was unable to fulfill the Fed Cup requirements.

Against 2011 US Open champion Stosur, Wozniacki was trailing 5-3 at the outset before taking four games in a row. That success came despite how hard it was for her to use her left arm, which even bothered her during ball tosses for serves. She said afterward she was surprised that the top-seeded Stosur kept hitting to her forehand even after the visit from the trainer.

“She started kind of running around her backhand a little bit more, which is pretty unusual for Caroline to want to do that. …

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