MADRID—Aryna Sabalenka is glad she changed her mind about playing at the Madrid Open. Two weeks after nearly withdrawing from the tournament because of a muscle injury, Sabalenka was standing on center court with the winner’s trophy in her hands on Saturday. Sabalenka defeated top-ranked Ash Barty 6-0, 3-6, 6-4 for her 10th WTA title—and first on clay. In the men’s final on Sunday, 2018 champion Alexander Zverev will face eighth-seeded Matteo Berrettini. Sabalenka’s victory, coming two weeks after she was hurt in a loss to Barty in the Stuttgart final, will move the Belarus player to No. 4 in the world next week. “To be honest, after the final in Stuttgart I was injured, I couldn’t even move, I really wanted to withdraw from here,” she said. “And I don’t know how, but my team … the recovery was really good. In four days they made me feel much …