Spain's Garbine Muguruza beat world number one Serena Williams in straight sets to win her first Grand Slam title at the French Open.
Fourth seed Muguruza won 7-5 6-4 to make amends for losing last year's Wimbledon final against Williams.
The 22-year-old is Spain's first female champion at Roland Garros since Arantxa Sanchez-Vicario in 1998.
Williams, 34, had hoped to win a 22nd Grand Slam singles title and tie Steffi Graf's Open-era record.
"I'm so, so excited - to play in a Grand Slam against one of the best players, it's the perfect final," Muguruza said.
"I'm so happy. I had to be very ready and concentrated on all the points and just to fight as much as I can.
"All the matches I've played against her helped me. It's our favourite tournament in Spain and I want to thank all my Spanish supporters."
Williams had reached the final despite reportedly struggling with a thigh problem, but the defending champion began in terrific form, moving freely as she made the early running.
It was all Muguruza could do to hang on, a forehand and an ace seeing off early break points, and it was Williams who faltered first by dropping serve with a double fault at 2-2.
With both players hitting huge groundstrokes and vying for control of the rallies, Williams looked to have gained the upper hand with three games in a row taking her 5-4 in front.
However, Muguruza played a nerveless service game to stay in the set and then clinched it with some wonderful hitting down both tram lines.
The second set began with three breaks of serve but it was still Muguruza who was dictating, another stunning forehand into the corner moving her into a 3-1 lead.
Muguruza was prepared to concede double-faults - her tally ending up at nine - to keep Williams at bay on her second serve and it proved a successful tactic.
Williams could not fashion a break point in the latter stages of the second set and did well to fend off four match points on her own serve in game nine.
Muguruza remained rock solid, however, finally converting on her own serve with a lob that caught both players by surprise, before the Spaniard fell to the clay in celebration.
Williams suffered only her sixth defeat in 27 Grand Slam finals stretching back to 1999, but did not blame her injury issues.
Williams was trying to win her fourth French Open title - the first came back in 2002.
"It was OK," she said. "I'm not one to ever make excuses and say, like, 'Oh, my adductor was hurting,' or whatever.
"At the end of the day I didn't play the game I needed to play to win and she did. Adductor or not, she played to win.
"She won the first set by one point. I mean, that just goes to show you that you really have to play the big points well, and she played the big points really well.''
The American has now missed out in three consecutive Grand Slams, and will head to Wimbledon later this month looking to defend her title and finally land a 22nd major.
BBC tennis correspondent Russell Fuller
"Grand Slam singles champions born in the 1990s are no longer unique. Muguruza emulated Petra Kvitova's achievement by winning here at the age of 22, which is very young by modern standards.
"She has the big serve, lethal power from the baseline, and showed a cool head and a strong heart to close out the match after Williams had saved those four championship points. Players are developing the belief to beat the world number one, but a semi-final and two finals from the last three Grand Slams show Williams is far from done yet."