Since seeing their 41-match winning streak ended in Doha, Hingis and Mirza have endured a relative barren patch, going four tournaments without silverware. However, inside the Caja Mágica they are casting a spell once more over their opponents, mastering No.6 seeds Hlavackova and Hradecka, 6-3, 6-2.
This masterclass sets up a semifinal clash with a resurgent Vania King and Alla Kudryavtseva, winners of a far closer encounter in the preceding match on court. Taking on No.4 seeds Chan Hao-Ching and Chan Yung-Jan, King and Kudryavtseva recovered from a slow start to prevail, 2-6, 6-4, 11-9.
On the other side of the draw, Carolina Garcia and Kristina Mladenovic continued their fine clay court campaign with victory over No.3 seeds Timea Babos and Yaroslava Shvedova.
Garcia and Mladenovic arrived in the Spanish capital having won their opening two clay court events, in Charleston and Stuttgart, and their 6-4, 6-3 victory over Babos and Shvedova extends their unbeaten streak on the surface to 11 matches.
Ekaterina Makarova and Elena Vesnina are the next team tasked with ending this run. French Open champions in 2013, Makarova and Vesnina advanced without striking a ball after Svetlana Kuznetsova and Anastasia Pavlyuchenkova withdrew after the latter failed to recover sufficiently from an adductor