Alexander Zverev and Grigor Dimitrov advance at Shanghai Masters

Alexander Zverev and Grigor Dimitrov advance at Shanghai Masters

The 28-year-old, ranked 50th in the world, lost the first set 6-0 to the fifth seed, and was trailing 4-0 in the second when he decided not to continue. "I think we both played pretty well from the baseline".

"It doesn't matter how long you are on court, (the) most important thing is be enough competitive to (handle) all the situations". But Dimitrov won the final five points to get through. But 16th seeded Del Potro found his form in the second set, scored 5 love games and levelled the set-score with a 7-5 victory in the tie-break.

In the quarterfinals, Nadal will play sixth-seeded Grigor Dimitrov of Bulgaria, who got past Sam Querrey of the US 6-3, 7-6 (3).

Federer, the Swiss world No. 2, plays Richard Gasquet in the last eight today after Gasquet outlasted fellow Frenchman Gilles Simon in a marathon three-setter 7-5, 6-7 (5), 6-3.

Bedene's match in Shanghai was the game that followed Grigor Dimitrov's win over Ryan Harrison. "I just had to find my way through the whole match".

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Del Potro knew Zverev's reaction to losing serve was likely a good omen.

Del Potro, pushed to the brink of retirement by four wrist surgeries that saw his ranking slip as low as 1,045 at one point in his career, said Zverev would learn. "He's still very young and has to keep learning".

Del Potro, the 2013 Shanghai Masters runner-up, will face either American no. 12 seed John Isner or Viktor Troicki of Serbia on Friday.

Fourth seed Marin Cilic of Croatia and Spain's Albert Ramos-Vinolas go head to head in the other quarterfinal.

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