Coming forward more often, mixing in drop shots and trusting her touch, Aryna Sabalenka's game is evolving beyond brute force -- and the results are starting to show on clay.

MADRID—This time, Iga Swiatek had the answers against teenage sensation Alexandra Eala. After a quarterfinal loss to the rising star from the Philippines last month in Miami, Swiatek rallied to a 4-6, ...