ROME (AP) — Top-ranked Iga Swiatek remained on course for an uncommon Madrid-Rome double after beating Angelique Kerber to reach the Italian Open quarterfinals on Monday.

It was a ninth straight win for Swiatek, and the two-time Rome champion will next face Madison Keys after the American player eased past Sorana Cirstea 6-2, 6-1 in a match that was interrupted by an environmental protest.

Swiatek needed eight set points to secure the opener but had no such problems at the end of the second, sealing a 7-5, 6-3 victory on the first match point when Kerber’s return went wide.

The match against Keys will be a repeat of last week’s Madrid Open semifinal, which Swiatek won. The Polish player is attempting to become the first woman to win the “dirt double” since Serena Williams in 2013.

“For sure, playing against Maddie is not easy,” Swiatek said. “The score was pretty one way in Madrid. It’s kind of easy for your mind to just drift off sometimes. The most important thing is to stay focused and really disciplined.”