Daniela Hantuchova of Slovakia celebrates after winning her women's singles fourth round match against Alison Riske of the United States at the 2013 US Open in New York, the United States, on Sept. 2, 2013. Daniela Hantuchova won 2-1. (Xinhua/Wang Lei)

Daniela Hantuchova of Slovakia celebrates after winning her women's singles fourth round match against Alison Riske of the United States at the 2013 US Open in New York, the United States, on Sept. 2, 2013. Daniela Hantuchova won 2-1. (Xinhua/Wang Lei)

Daniela Hantuchova of Slovakia returns a shot during her women's singles fourth round match against Alison Riske of the United States at the 2013 US Open in New York, the United States, on Sept. 2, 2013. Daniela Hantuchova won 2-1. (Xinhua/Wang Lei)

Daniela Hantuchova of Slovakia returns a shot during her women's singles fourth round match against Alison Riske of the United States at the 2013 US Open in New York, the United States, on Sept. 2, 2013. Daniela Hantuchova won 2-1. (Xinhua/Wang Lei)

Daniela Hantuchova of Slovakia returns a shot during her women's singles fourth round match against Alison Riske of the United States at the 2013 US Open in New York, the United States, on Sept. 2, 2013. Daniela Hantuchova won 2-1. (Xinhua/Wang Lei)

Daniela Hantuchova of Slovakia celebrates after winning her women's singles fourth round match against Alison Riske of the United States at the 2013 US Open in New York, the United States, on Sept. 2, 2013. Daniela Hantuchova won 2-1. (Xinhua/Wang Lei)