Former world number one Caroline Wozniacki is on the comeback trail at the US Open in New York.

The unseeded Dane has beaten 9th seed and former champion Svetlana Kuznetsova 6-4, 6-4 to reach the third round.

Wozniacki is ranked 51 in the world.

Men's defending champion Novak Djokovic has received a walkover win into the third round with his opponent Jiri Vesely failing to recover from a five set first round win.

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Kiwis Michael Venus and Marina Erakovic have won their first round doubles matches at the US Tennis Open in New York.

Venus and Croatian partner Mate Pavic have beaten a Chilean Argentine pair 6-4, 6-4.

Erakovic and Spanish partner Arantxa Parra Santonja have won in three sets over a Serbian Romanian combination.