Lleyton Hewitt pulled off a stunning five-set win over Juan Martin del Potro at the US Open after a classic late-night thriller between the two former champions on Friday.

Twelve years after he upset Pete Sampras to win the US Open, the 32-year-old Hewitt showed he still has plenty of fight left in him as he floored Del Potro 6-4 5-7 3-6 7-6 6-1 in a four-hour slugfest at Arthur Ashe Stadium.

“I don’t know how many years I have left in me so I was just hanging to get back on this court again,” said Hewitt, who also won Wimbledon in 2002 but has not tasted grand slam success since and tumbled to 66th in the world rankings.

“This is why I still play, to have moments like this.”

Del Potro had his chances but ran out of gas, unable to keep up with one of his childhood heroes, eight years his senior.

Del Potro became the biggest casualty of this year’s champion-ship, leaving the top half of the draw seemingly at the mercy of Novak Djokovic and Andy Murray, who both overcame wobbles to win their latest matches.

Murray experienced a minor hiccup, dropping his first set of the tournament, but recovered quickly to beat Argentine baseliner Leo-nardo Mayer 7-5 6-1 3-6 6-1.

Djokovic kept his perfect record intact after surviving an early test from Germany’s Benjamin Becker on a baking hot day at Flushing Meadows.

The world number one saved two set points in the opening set before rebounding to win 7-6 6-2 6-2 and advance to the next round against Portugal’s Joao Sousa, a five-set winner over Jarkki Nieminen of Finland.

The spectator lines were impressive at court 17 when Martina Hingis made her comeback to grand slam tennis 16 years after she won the US Open and six years after she retired for a second time.

The former world no.1 was granted a wildcard entry to the doubles with Daniela Hantuchova but the pair fell at the first hurdle, losing 6-3 7-5 to defending champions Sara Errani and Roberta Vinci.

For Hingis it was a return to forget as she finished with back-to-back double faults to close out the match then lost a mixed doubles match, although the 32-year-old said she wanted to keep going.

“I think it’s because I just played a lot and my body’s not used to it,” she said.

“I feel like I’m playing well but my body is screaming, ‘What are you doing to me’?”

Meanwhile, Serena Williams steamrolled her way into the fourth round of the women’s singles with a routine 6-3 6-1 win over Yaroslava Shvedova that didn’t finish until after 1am yesterday.

She faces a tricky assignment against Sloane Stephens, who beat her at the Australian Open.

Stephens earned her place in the fourth round by beating Jamie Hampton 6-1 6-3 in a battle bet-ween two of America’s brightest young prospects.

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