Novak Djokovic and Serena William have reached the third round of the US Open.
Defending champion Djokovic shrugged off a shoulder problem to defeat Argentine Juan Ignacio Londero 6-4, 7-6, 6-1.
Meanwhile, Williams kept alive her hopes of securing a record-tying 24th Grand Slam title with a 5-,7 6-3, 6-1 win over American wildcard Catherine McNally.
In other games, second seed Ashleigh Barty overcame American Lauren Davis 6-2, 7-6, while 10th seed Madison Keys beat China's Zhu Lin 6-4, 6-1.

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