The Spaniard became the youngest player ever to be ranked No. 1. The old mark was held by Australia's Lleyton Hewitt, who rose to the top at age 20 in 2001 during his Hall of Fame career.
She notched her 12th straight win over American Alison Riske-Amritraj 6-4 6-1 on Sunday, after becoming the first qualifier to win a WTA Tour 1000 event in Cincinnati, the final of three titles she's collected so far this year.
