
Stan Wawrinka raises his arms in celebration after seeing off Lukas Rosol in five sets in the first round.

Rosol, the man who upset Rafael Nadal at Wimbledon in 2012, led two sets to one.

But Wawrinka eventually prevailed 4-6 6-1 3-6 6-3 6-4 to set up a clash with Japan's Taro Daniel.

Andy Murray, the second seed in Wawrinka's half, trailed Radek Stepanek two sets to one when darkness halted play.

Garbine Muguruza, the 2015 Wimbledon finalist, rallied to defeat Anna Karolina Schmiedlova 3-6 6-3 6-3.

It was Schmiedlova's 12th consecutive main draw loss at the highest level.

Kei Nishikori, the 2014 U.S. Open finalist who has had a solid clay-court season, completed a 6-1 7-5 6-3 victory over Simone Bolelli.

Women's second-seed Agnieszka Radwanska, who lost in the first round last year, had no trouble dispatching Bojana Jovanovski 6-0 6-2.