Federer subsequently eased past Richard Gasquet in straight sets to book a last-four clash, but it remains to be seen whether Del Potro will be fit to face the Swiss on Saturday.
The Spaniard got the mini-break for a 3-0 lead in the tiebreak, but sixth seed Dimitrov scrapped back to level, and then stunned Nadal to clinch the tiebreak. "If not, I will be nearly dead because he is going to go for the shots".
"It's better like this than having long matches, you save, a little bit more, the body", Nadal said. "I would like to play and be 100 per cent".
The Argentine recovered from a slow start to triumph 4-6, 6-1, 6-4. Nonetheless, his superb serving eventually got him through the mentally-draining service game, successfully claiming the first set 6-3 after just 35 minutes of play. "Of course, being able to win the U.S. Open, Beijing, and being in the semifinals here ..."
Fourth-seeded Cilic stands between Nadal and a second ATP final in two weeks.
"I think (it was) a great battle between two players who are playing all the time very focused, very intense points".
"I felt good in the first match", the 36-year-old said.
The 2014 US Open champion knocked out Spain's unseeded hopeful Albert Ramos, 6-3, 6-4.
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United States of America and Ghana clash on Monday in the next group game, before the Americans conclude group play vs. But India's inability to maintain possession for more than two passes in the opposition half seemed to embolden them.
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