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, its nothing, Wozniacki said. But then I hit another backhand and I was like, OK, its something. And it just got worse.Its the latest in a series of setbacks this season for Wozniacki, the US Open runner-up in 2009 and 2014.She hasnt 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 cant catch a break. Im thinking, Im going to catch a break sooner or later. But right now, its just like one thing after the other, Wozniacki said. I feel like Im hitting it pretty well. Im serving well. And its like, this happens. Its just like really disappointing.Wozniacki is supposed to represent Denmark at the Rio de Janeiro Olympics next month and carry her countrys 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. So I kind of thought, OK, theres something going on, Stosur said.As for why she had trouble taking control of the match, Stosur replied: Sometimes its quite difficult playing somebody whos injured.The match was played on a secondary grandstand court, instead of in the hard-court tournaments main stadium, which features more mens matches than womens matches during the joint event.I notice theres not too many matches on center court for the women, unfortunately, Stosur said when asked by a reporter about the scheduling. Itd be nice if we were kind of 50-50 on center court, thats for sure.On the mens side, American Ryan Harrison?beat 10th-seeded?Viktor Troicki?of Serbia 7-6 (4), 6-4 to reach the Citi Opens third round as a qualifier.For Harrison, now 24 and nearly a decade into his professional career, it represents the first time he has won back-to-back main-draw matches in 2016. It also represents a real step in the right direction for someone who reached his career-best ranking of 43rd in 2012 and is now 158th.Mentally, its been an up-and-down ride over the last couple years, because the hardest thing to do when youve had early success and you hit a speed bump is to let go of the negative, Harrison said after beating Troicki in front of a standing-room-only crowd. You can dwell on so many things. At so many stages of my career, Ive been angry and irritated. Ive been discouraged. Not depressed in my life, but disappointed with the way that Im playing.You can get in a sulky mode. Everything thats built up from negative moments can creep back in. The biggest thing for me moving forward is just being who I am today. I know what I can do, I know the level Im capable of playing, and when I do let go of all that stuff then I feel I give myself chances to win. Because I dont doubt myself from an ability standpoint.Harrison converted only three of 22 break points, but he counted it as a positive that he didnt let all the missed chances get to him.When youre in a situation like Im in -- that you havent won a ton of matches -- it seems like its tough to convert on opportunities. And its easy to get discouraged. You miss your first couple, and you feel like youve lost the match, he said. For me, the biggest turning point for this week, compared to other weeks, has been when Im not getting that first opportunity, [Im] staying in there and creating more.Next for Harrison is an all-American matchup against fifth-seeded Steve Johnson, who beat Adrian Mannarino of France 6-3, 6-4.Others advancing included top-seeded John Isner, No. 2 Gael Monfils -- who hadnt won a match since early May and said hed missed time on tour recently because of a virus -- No. 3 Bernard Tomic, No. 6 Jack Sock and No. 15 Marcos Baghdatis.In a match involving two of the three teens in the ATPs top 100, seventh-seeded Alexander Zverev of Germany saved all five break points he faced and overwhelmed Taylor Fritz of the U.S. 6-4, 6-2. They were born six months apart in 1997, but Zverev brushed off the idea that this was a significant meeting of two members of tennis next generation.It doesnt mean a lot for the future, Zverev said. We both know that theres a lot of improvements to be made for both of us.The third teen in the top 100, Borna Coric, won Wednesday and faces Monfils next.In womens play, wild-card entry Jessica Pegula defeated Christina McHale 7-5, 6-2 to reach her first WTA quarterfinal.McHale, who pushed Serena Williams to three sets at Wimbledon, is the sister of Harrisons fiancee, Lauren.Their wedding date is in March, which coincides with the closing weekend of the Masters tournament in Miami.So, noted Harrison, smiling and sounding as confident as ever, we are hoping to have to reschedule.Information from The Associated Press was used in this report.? Nike TN Schuhe Günstig .C. - The Carolina Hurricanes have placed backup goalie Anton Khudobin on injured reserve with an unspecified lower-body injury. Air Max Classic BW Selbst Gestalten . 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