SHANGHAI -- Rafael Nadal tied Andre Agassi for sixth place on the list of all-time Open era wins when he reached the Shanghai Masters semifinals on Friday.
Juan Martin del Potro, meanwhile, suffered a left wrist contusion on a nasty fall during his quarterfinal win and was taken to a hospital, where it was placed in a splint. Jorge Viale, his agent, said on Twitter that "more serious problems were ruled out."
He will decide Saturday whether or not to play his semifinal match against No. 2 seed Roger Federer, who del Potro beat in the US Open quarterfinals earlier this year.
Nadal, the top seed, topped Grigor Dimitrov of Bulgaria 6-4, 6-7 (6), 6-3 for his 870th match win. Nadal also improved his win streak to 15 having won the China Open last week. In Beijing, he defeated Dimitrov in a three-set semifinal.
Nadal has yet to drop serve in Shanghai.
Dimitrov extended the quarterfinal to a third set when he rebounded from a 4-2 deficit to win the second-set tiebreaker.
In the third set, Nadal saved the one break point he faced in the match in the fifth game, and broke serve in the sixth to set up victory.
"Winning a lot of matches in a row, so I'm very happy for everything," Nadal said. "Of course, being able to win the US Open, Beijing, and being in the semifinals here ... I have to try to keep focus and hold that momentum. We'll see tomorrow if I can have another good day."
Del Potro instinctively tried to break his fall with his left wrist as he tumbled on the court in the third set of a 4-6, 6-1, 6-4 victory against Viktor Troicki of Serbia.
Del Potro, who has undergone surgery on both wrists, conferred with a trainer as he repeatedly shook his wrist. He wound up breaking Troicki's serve en route to securing his third semifinal berth of the season, though he's unsure if he'll be able to play.
"I don't know how my wrist is after I fell down," del Potro said before leaving for a local hospital. "I felt something wrong in that moment, but I continued to play, just playing (backhand) slices just to finish the match. I'm going to the hospital to see what the MRI says, and what the doctor says.
"Then I will take a decision for tomorrow. I would like to play and be 100 percent."
Federer beat Richard Gasquet 7-5, 6-4 in his quarterfinal match.
"I hope for him (del Potro) that it's nothing serious," Federer said. "He's had problems in the past and this is why he's worried, rightfully so. At the end of the day nothing changes for me, I'll be ready to come out here to play, and it's for revenge for the US Open."
Cilic advanced to his first Shanghai semifinal by beating Albert Ramos-Vinolas of Spain 6-3, 6-4.
The 25th-ranked Ramos-Vinolas ended Cilic's streak of winning 21 service games in the sixth game of the second set.
"I was a little bit angry with myself just with not keeping up the good tennis at that moment," Cilic said.