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Top-ranked Novak Djokovic, Serena Williams reach semifinals at Cincinnati

  • Stanislas Wawrinka, of Switzerland, returns the ball to Novak Djokovic, of Serbia, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 21, 2015, in Mason, Ohio. (AP Photo/John Minchillo)

    Stanislas Wawrinka, of Switzerland, returns the ball to Novak Djokovic, of Serbia, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 21, 2015, in Mason, Ohio. (AP Photo/John Minchillo)  (The Associated Press)

  • Novak Djokovic, of Serbia, returns the ball to Stanislas Wawrinka, of Switzerland, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 21, 2015, in Mason, Ohio. Djokovic defeated Wawrinka 6-4, 6-1. (AP Photo/John Minchillo)

    Novak Djokovic, of Serbia, returns the ball to Stanislas Wawrinka, of Switzerland, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 21, 2015, in Mason, Ohio. Djokovic defeated Wawrinka 6-4, 6-1. (AP Photo/John Minchillo)  (The Associated Press)

  • Serena Williams returns the ball to Ana Ivanovic, of Serbia, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 21, 2015, in Mason, Ohio. (AP Photo/John Minchillo)

    Serena Williams returns the ball to Ana Ivanovic, of Serbia, during a quarterfinal match at the Western & Southern Open tennis tournament, Friday, Aug. 21, 2015, in Mason, Ohio. (AP Photo/John Minchillo)  (The Associated Press)

Novak Dkojovic and Serena Williams reached the semifinals in Cincinnati, taking different ways to get there.

The top-ranked players at the Western & Southern Open played early Friday. Dkojovic beat fifth-seeded Stan Wawrinka 6-4, 6-1. Williams followed on center court, struggled with her serve, and rallied to beat Ana Ivanovic 3-6, 6-4, 6-2.

Djokovic has never won at Cincinnati, the only one of the nine ATP Masters events that has eluded him. He's trying to become the first to win all nine.

Williams won the tournament for the first time last year by beating Ivanovic in the finals. She's using the tournament as a final tuneup for the U.S. Open, where she'll try to complete a Grand Slam sweep.

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