Breaking down a marquee matchup
Saturday's semifinals will pit world No. 1 and defensive maven Caroline Wozniacki, looking for her first Grand Slam singles title, against the unofficial No. 1 player and all-time great Serena Williams, who is seeking her 14th major. Cliff Drysdale breaks down that match, and also predicts that Sam Stosur will get past southpaw Angelique Kerber in the other semi.
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