NEW YORK — Top seed Novak Djokovic has been starved of competitive action at the US Open but on Sunday the world No 1 feasted on unseeded Briton Kyle Edmund in a 6-2 6-1 6-4 romp that put him into the quarterfinals.In other matches on Sunday, Angelique Kerber reached the US Open quarterfinals on Sunday, leaving Serena Williams needing to reach the final to have a chance of retaining the world No 1 spot.And Lucas Pouille outlasted 14-time Grand Slam champion Rafael Nadal in a five-set classic to lead a trio of Frenchmen into the quarterfinals of the US Open. The other two are Jo-Wilfried Tsonga and Gael Monfils.READ THIS: Serena shoulders burden of history at Flushing MeadowsDjokovic had a second-round walkover as Czech Jiri Vesely withdrew due to injury, and was leading 4-2 in his third-round match when Russian Mikhail Youzhny retired with a leg ailment, making it six days since his last full match.The Serb kept himself busy on the practice courts but was happy to cut loose against...

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