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No. 1 Rafael Nadal, John Isner seal quarterfinal clash in Beijing

No. 1 Rafael Nadal, John Isner seal quarterfinal clash in Beijing

Earlier, top-ranked Rafael Nadal joined Kyrgios in the semis, beating sixth-seeded John Isner 6-4 7-6 (7-0).

Despite Nadal's one-sided record against Isner, it was a hard-fought contest from the outset, and the American showed off his outstanding serving as he fired down 22 aces, per ProTennisLive.

"Of course, he is a player that I really have like a good friend on the tour".

Juan Martin del Potro stormed into round two with a 7-6 (4) 6-4 win over Uruguay's Pablo Cuevas and will face third seed Grigor Dimitrov, who battled past Bosnian Damir Dzumhur 6-1 3-6 6-3. "I think I played much better than Wuhan", she said, per the WTA.

"Not important, (but) I am still feeling (it) a little bit by the way", Nadal, who attempted to wash the suspected fibre out with water, added with a smile.

"I saw his match today". Krygios was leading 6-0 3-0 when opponent Steve Darcis retired injured, and he will face Alexander Zverev in the next round.

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In the women's singles event, second-seed Simona Halep also made it to the semi-finals after clinching an easy 6-2, 6-1 win over Daria Kasatkina of Russian Federation in their last-eight clash.

Open last month while Dimitrov looks to reach the final in Beijing for a second straight year.

Halep, 26, could potentially usurp Muguruza at the top if she reaches the final in Beijing. I think Grigor is a player who always plays with a great attitude, with a positive character.

But doing that on clay with the amount of effort you need to become a French Open champion, with best-of-five on clay, with the heat, with the conditions on the court, with the wind, with all the balls in the court you need to spend two, three hours on the court, winning 10 is absolutely out of this world.

In the women's, a heavyweight clash pitched two-time Wimbledon champion Petra Kvitova against Denmark's former No. 1 Caroline Wozniacki.