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The world No.1 dropped just two games as she inflicted a comprehensive 6-1 6-1 rout on her Romanian opponent in the Spanish capital.

Swiatek, who was runner-up to Aryna Sabalenka in last year's event, will play Sara Sorribes Tormo in the Round of 16 after the Spaniard defeated two-time Australian Open champion Victoria Azarenka.

The Pole is now 26-4 for the season, in which she has already triumphed at the Qatar Open and Indian Wells Open, as she eyes the ninth WTA 1000 singles title of her career.