Top seed Caroline Wozniacki will hope to use her boxing training to deliver another knockout performance in today's women's semi-finals at the US Open. <img alt="" src="/imagedata/2010/sep/woz_3.jpg" border="5" /> Wozniacki has dropped just 17 games in setting up a last-four clash with Russia's Vera Zvonareva, the seventh seed joining top three seeds Wozniacki, Kim Clijsters and Venus Williams in the semi-finals. The 20-year-old Dane uses boxing training to get in shape for tennis and her counter-punching style is certainly proving effective as she looks to go one better than last year, when she lost to Clijsters in the final. "Boxing is just a different way for me to work out," explained Wozniacki, who has a 19-1 win-loss record since Wimbledon. "It's fun, it's interesting and it's great because I have this great coach who knows how to get me in good shape and what I need for my tennis as well. "I wanted to try something different, something that was not the usual things. I just love the training. It's great. It's really hard not only physically, but also the conditioning. "There are similarities, you need fast arms, fast feet. Mikkel Kessler, the Danish boxer, is one of my friends as well. I support him when I can. And Joe Calzaghe, when he was boxing, I thought he was really great because he was so fast. It's amazing how he was boxing."u00a0 Zvonareva will be no pushover for Wozniacki after reaching the Wimbledon final in July where she lost to Serena Williams, who is absent from New York with a foot injury. "I think Caroline's got enough experience right now," the seventh seed said. "She's very mature for her age and I think a lot of people are underestimating her. She's going out there and she's doing her job very, very well."Wozniacki won the pair's last meeting in the final in Montreal recently, Zvonareva adding: "In Montreal I think I just couldn't find my game. "I think I had to play Victoria (Azarenka) in the morning (due to a weather delay) and they have absolutely different styles of game, Victoria and Caroline. It was very difficult for me just to change the mindset and switch to another match." At 30, Williams is by far the oldest of the four remaining players, but semi-final opponent Clijsters believes the American is benefiting from a long injury lay-off which meant she did not play between Wimbledon and the US Open.

Twin problems for Bopanna-Qureshi 

Wozniacki'S boxing training could come in handy for today's semis.

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