American Bethanie Mattek reached the second semifinal of her career, upsetting third-seeded Nicole Vaidisova 6-3, 6-0 in the DFS Classic quarterfinals on Friday.Mattek, a 23-year-old from Miami, next plays teenager Yanina Wickmayer, who defeated Briton Melanie South 6-4, 6-3 in their quarterfinal match. The only other semifinal for Mattek was at Cincinnati in 2005, and she has not won a WTA tournament.Vaidisova, ranked 19th in the world, failed to convert two break chances while trailing 5-3...
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