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Novak Djokovic slams a forehand - Source: Reuters -
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A lacklustre Novak Djokovic survived an unlikely battle with American world number 276 Jesse Witten before clinching a 6-7 6-3 7-6 6-4 victory in the third round of the US Open on Sunday.
In a match containing 15 breaks of serve, the Serbian fourth seed was well below his best and Witten pushed him hard before finally wilting after three hours, 28 minutes.
Witten came from 5-2 down to snatch the first set on a tiebreak but Djokovic levelled and then played a decent tiebreak himself to win the third.
In just his second grand slam event, Witten stayed with Djokovic in the fourth set until 4-4 when the Serb broke and then held on to set up a fourth-round match with Czech 15th seed Radek Stepanek