Nadal will face Grigor Dimitrov in the semi-finals, while Nick Kyrgios also qualified for the final four. I was playing good at the beginning of the second and probably I had nearly match point with those two break points for 3-love.
The in-form American, the sixth seed, is renowned for his booming service game and Nadal expects to come under a barrage on Friday. "I think it was just a hair or something, a hair from the tennis ball".
However Nadal - a champion in Beijing 12 years ago - ultimately got back on track to win an absorbing encounter 6-3 4-6 6-1.
Second-seed Alexander Zverev moved past Fabio Fognini 6-4, 6-2 on Thursday to set up a quarterfinal match with Russia's Andrey Rublev.
Asked by AFP what those were, she smiled: "I tell you one, only one: to win a Grand Slam, which you know".
The world number one will play third seed Grigor Dimitrov of Bulgaria after his 7-6 (7-5) 4-6 6-2 win against Spain's Roberto Bautista-Agut.
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'It was not important, but I am still feeling it a little bit'.
In the second set, the two players stayed 6-6 for a while until a tiebreaker in which Isner's performance declined and the Spaniard took his chance and won the match.
"When I have been in that position (injured), I don't remember the people talking that much about these things", Nadal said after defeating the 26-year-old Dimitrov in their semi-final. "He's a great guy".
The 31-year-old Peng said she had been having injections to ease the pain and her knee was heavily strapped, but she could not play on.
"Tomorrow will be a tough one against Isner". Let's see. I going to try to play my best. The Australian, eighth headlining, triumphed when his opponent Steve Darcis has abandoned because of pain in the neck when he fired from the back 6-0, 3-0.