Some numbers from around the tennis world:
6-7: Li Na's record since winning the French Open.
5-5: Petra Kvitova's record since winning Wimbledon.
3: Consecutive tournaments in which Samantha Stosur and Maria Kirilenko have met. Stosur won a three-setter at the U.S. Open and Kirilenko won three-setters in Toyko and Beijing. The Aussie is 1-2 since winning the U.S. Open, with both losses to the Russian.
19-1: Andy Murray's record since the start of the Western & Southern Open in mid-August. His only loss in that stretch was to Rafael Nadal in the U.S. Open semifinals.
43: Donald Young's ranking, a career high and, according to the ATP Tour, an 85-spot improvement since he was No. 128 on Aug. 1.
3: Years between victories for Ana Ivanovic against a top-five player, per the WTA Tour. Before this week, Ivanovic had been 0-9 in such matchups since defeating Jelena Jankovic at the 2008 French Open semifinals. Ivanovic ended the drought on Wednesday with a 6-2, 6-1 win over No. 3 Vera Zvonareva.
12: Consecutive games won by Tomas Berdych in his 6-1, 6-0 win over Fernando Verdasco in the China Open quarterfinals Friday.
64: Victories this season for both Novak Djokovic and Rafael Nadal, who can pass the Serb for the ATP lead with a win against Mardy Fish in the Japan Open semifinals Saturday.
62: Victories this season for Caroline Wozniacki, a WTA high.
140: Main-draw wins for Flavia Pennetta since the start of 2009, second most on Tour behind Wozniacki's 191, according to the WTA. Pennetta upset Wozniacki in the China Open quarterfinals Friday. 4: Women who have made a Tour-leading 12 quarterfinals this year (Wozniacki, Andrea Petkovic, Zvonareva and Marion Bartoli).