The 22-year-old Spaniard produced a pristine performance by beating Serena Williams 7-5 6-4.
Spaniard Garbine Muguruza on Saturday defeated Serena Williams to win the French Open women's singles final in Paris.
Muguruza beat Williams 7-5, 6-4.
The American tennis star, who had won the Grand Slam three times before, lost the final for the first time in her career.
The 22-year-old Spaniard dethroned Williams in an 1h:43min and became the first Spanish woman to win the Suzanne Lenglen Cup since Arantxa Sanchez-Vicario in 1998.
Muguruza said, "The match point was really weird. Serena was in front of the ball so I didn't know if it was in or out. I looked at the umpire and he doesn't want to say anything. I was like, 'did I win Roland Garros?'
"When he said, 'game, set, and match'...it was like ...no way. I won. It was amazing."