SECOND seed Rafael Nadal allayed fears over his knee injury after sweeping past former world No2 Tommy Haas.
Nadal (inset), who had complained of “unbelievable’ pain earlier this week, won 6-4, 6-3, 6-4 to book a third-round match with Slovakian Lukas Lacko.
The Spaniard said: “It is much better and I am so happy the knee is improving and I am able to play without pain.”
Third seed Roger Federer eased through after his opponent, Andreas Beck, withdrew with a back injury, but eighth seed Mardy Fish suffered a shock straight-sets elimination against Colombia’s Alejandro Falla.
Women’s defending champion Kim Clijsters dropped just one game as she ruthlessly despatched Stephanie Foretz Gacon.
Top seed Caroline Wozniacki needed a second-set tie-break to beat Georgia’s Anna Tatishvili, but French Open winner Li Na and third seed Victoria Azarenka progressed with ease.