Twenty-four hours on from ruthlessly dispatching Ekaterina Makarova, Muguruza delivered another polished display as she ramped up her French Open preparations. Her 6-1, 6-4 victory over Ostapenko sets up a quarterfinal meeting with Timea Bacsinszky, conqueror in three sets of the draw's other remaining Spaniard, Carla Suárez Navarro.
Against Muguruza, she started promisingly, too, threatening an immediate break. However, she was unable to seize upon this early chance, Muguruza negotiating a tricky opening service game, then breaking herself when she found the baseline with a heavy forehand return.
Ostapenko continued to press, yet it was Muguruza that continued to win the points that mattered to take the set by a misleadingly one-sided scoreline. In the second the teenaged finally got the reward her endeavors merited, breaking for a 3-1 lead when she wrong-footed Muguruza with a smart cross-court backhand.
But with a third set looming, the World No.4 eased through the gears, rattling off the final five games to bring the teenager's run to an abrupt halt.
Muguruza will start as favorite going into her quarterfinal with Bacsinszky, a player she has never lost to. Despite this ominous statistic, Bacsinszky goes into their fourth encounter in confident mood.
A title in Rabat and a decent showing in Madrid has pushed the Swiss back into the Top 10, a status she underlined with a battling victory over one of the tour's best clay courters, Suárez Navarro. Trailing 5-4 in the second set, Bacsinszky came within two points of defeat, before turning the match on its head to prevail, 5-7, 7-5, 6-2.