Nadal hadn't won an ATP hard-court title in more than three years until the U.S. Open last month, and now he's gunning for his third in five weeks.
The Argentine dug deep against the 20-year-old German to win 3-6 7-6 (7-5) 6-4 in the third round, to book a quarter-final spot for just the second time.
Del Potro dropped his opening service game of the match as Zverev took the first set comfortably in just 26 minutes.
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"I played a very good match, I don't know how many mistakes I made, but very few", said the 16-time Grand Slam victor and top seed in Shanghai.
But Del Potro levelled by taking the second set on a tie-brack, and when the 29-year-old secured a break of serve in the decider the red midst descended on Zverev.
The 46th-ranked Harrison led 4-2 in the third set and then 6-3 in the tiebreaker.
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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.
"I saw his frustration, for sure", del Potro said.
"He has everything to be in the top positions in the future, but these things happen. He broke racquets too".
Fourth-seeded Marin Cilic will face Albert Ramos-Vinolas of Spain.
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