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RIO DE JANEIRO， Sept. 9 (Xinhua) -- China's Pan Shiyun set a world record to win gold in the men's 50m freestyle S7 at the Rio Paralympics on Friday.


Pan clocked 27.35 seconds to beat the previous record of 27.67 set by Britain's David Roberts in 2008.


Ukraine's Ievgenii Bogodaiko took silver in 27.64 and Colombia's Carlos Serrano Zarate grabbed bronze in 28.60.


It was Pan's his third Paralympic Games gold medal after his triumphs in the 100m freestyle S7 and 50m butterfly S7 at the London 2012 Games.


The 27-year-old lost the use of his right arm in an electrical accident at age 11.

Rafael Nadal hits a return against Alexander Zverev on Saturday. Photo: CFP

Rafael Nadal's aging legs outlasted German teenager Alexander Zverev in an epic five sets as Serena Williams sailed into the last 16 at the Australian Open on Saturday.


Nadal needed all his trademark grit against Zverev Scarpe Uomo Nike Cortez Classic Nylon Blu Bianche Saldi , 19, dubbed "the future of tennis," and his superior fitness told as he ground out a thrilling 4-6, 6-3, 6-7 (57), 6-3, 6-2 win.


Germany's Zverev looked in discomfort as he won a punishing 37-shot rally nearly four hours into their contest as Nadal Scarpe Donne Nike Cortez Classic Nylon Blu Grigie Rosa Saldi , still full of running, pressed his advantage in the final set.


It means Nadal, 30, follows fellow veteran Roger Federer into the last 16 of a contest now missing defending champion Novak Djokovic after his stunning defeat to Denis Istomin.


"Everybody knows how good Alexander is," said Nadal, who will play France's Gael Monfils in the fourth round. "He's the future of our sport, and the present."


Williams Scarpe Uomo Nike NSW Cortez Flyknit Nere Bianche Saldi , by contrast, had no such trouble as she brushed off fellow American Nicole Gibbs 6-1, 6-3 to maintain her charge toward a 23rd Grand Slam title.


Williams, back after an injury break at the end of 2016, has been in brilliant form and she will take some stopping as she zeroes in on Steffi Graf's Open-era record.


The next player to take on Williams will be Barbora Strycova, who ousted France's Caroline Garcia to earn a shot at the world No.2.


"Obviously I'm here for one reason," said Williams Scarpe Donne Uomo Nike Cortez Retro Nere Grigie Saldi , who again lifted her index finger in celebration at her victory, symbolizing the No.1.