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ROME — 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...