Tomas Berdych, the No. 4 seed from the Czech Republic, beat Spain's Marcel Granollers 7-5 6-4 while No. 9 seed Marian Cilic saw off South Africa's Kevin Anderson 6-2 6-3.
"I feel like this whole tournament I've only played clay-court players from my first round to now, and everyone was also smaller than me, " the 31-year-old said after Saturday's 7-5 6-2 win over Italian seventh seed Sara Errani -- beaten by Sharapova in last season's French Open final.