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Stan Wawrinka raises his arms in celebration after seeing off Lukas Rosol in five sets in the first round. Dennis Grombkowski/Getty Images Europe/Getty Images
Rosol, the man who upset Rafael Nadal at Wimbledon in 2012, led two sets to one. Dennis Grombkowski/Getty Images Europe/Getty Images
But Wawrinka eventually prevailed 4-6 6-1 3-6 6-3 6-4 to set up a clash with Japan's Taro Daniel. Dennis Grombkowski/Getty Images Europe/Getty Images
Andy Murray, the second seed in Wawrinka's half, trailed Radek Stepanek two sets to one when darkness halted play. Dennis Grombkowski/Getty Images Europe/Getty Images
Garbine Muguruza, the 2015 Wimbledon finalist, rallied to defeat Anna Karolina Schmiedlova 3-6 6-3 6-3. ERIC FEFERBERG/AFP/AFP/Getty Images
It was Schmiedlova's 12th consecutive main draw loss at the highest level. ERIC FEFERBERG/AFP/AFP/Getty Images
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. Dennis Grombkowski/Getty Images Europe/Getty Images
Women's second-seed Agnieszka Radwanska, who lost in the first round last year, had no trouble dispatching Bojana Jovanovski 6-0 6-2. Dennis Grombkowski/Getty Images Europe/Getty Images
