World number two Rafael Nadal and number four Andy Murray both progressed to the third round of the US Open, although in very contrasting circumstances.
Nadal was soaring with a two set lead (6-2 6-2) when Nicolas Mahut retired with an abdominal injury.
Murray, on the other hand, had to fight back from two sets down to beat Dutchman Robin Haase.
The Scot won 6-7 (5-7) 2-6 6-2 6-0 6-4 at the Louis Armstrong Stadium and will face 25th seed Feliciano Lopez in the third round.
Third seed Maria Sharapova crashed out from the tournament as Italy's Flavia Pennetta secured a shock third-round win.
The 26th seed Pannetta won 6-3 3-6 6-4 at the Arthur Ashe Stadium as Sharapova, one of the favourites for the win, failed to meet expectations.