Rafael Nadal advances to quarterfinals of China Open

Petra Kvitova of the Czech Republic returns a shot against Caroline Wozniacki of Denmark during their third round of the women's singles match in the China Open tennis tournament at the Diamond Court in Beijing, Thursday, Oct. 5, 2017. (AP Photo/Andy Wong)
Rafael Nadal of Spain tosses the ball to serve against Karen Khachanov of Russia during their second round of the men's singles match in the China Open tennis tournament at the Diamond Court in Beijing, Thursday, Oct. 5, 2017. (AP Photo/Andy Wong)
Caroline Wozniacki of Denmark hits a return shot against Petra Kvitova of the Czech Republic during their third round of the women's singles match in the China Open tennis tournament at the Diamond Court in Beijing, Thursday, Oct. 5, 2017. (AP Photo/Andy Wong)
Rafael Nadal of Spain hits a return shot against Karen Khachanov of Russia during their second round of the men's singles match in the China Open tennis tournament at the Diamond Court in Beijing, Thursday, Oct. 5, 2017. (AP Photo/Andy Wong)

BEIJING — Rafael Nadal earned his season-leading 58th victory on Thursday by beating Karen Khachanov 6-3, 6-3 to reach the quarterfinals of the China Open.

The top-ranked Spaniard, who won the French Open and U.S. Open this year, saved all six break points he faced and increased his lead over Roger Federer at the top of the rankings.

Nadal will next face John Isner. The big-serving American defeated Leonardo Mayer 6-0, 6-3.

"Tomorrow will be a tough one against Isner," Nadal said. "John is a very good player from the baseline, too. I saw him today. He played so aggressive, having a lot of success, hitting a lot of winners, returning very well."

Second-seeded Alexander Zverev also advanced to the quarterfinals, beating Fabio Fognini 6-4, 6-2. The German will next play Andrey Rublev, who defeated seventh-seeded Tomas Berdych 1-6, 6-4, 6-1.

In the women's tournament, Jelena Ostapenko advanced after Peng Shuai, the last Chinese player in the competition, retired from the match while trailing 3-0.

Also, third-seeded Sorana Cirstea defeated fourth-seeded Karolina Pliskova 6-1, 7-5, Caroline Garcia beat Alize Cornet 6-2, 6-1, and Petra Kvitova beat former No. 1 Caroline Wozniacki 6-1, 6-4.

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