Laura Robson was hammered 6-3 6-2 by Caroline Wozniacki in a hugely disappointing first round defeat at the French Open.
The British No 1 came into the match with high hopes of beating the tenth seed at Roland Garros.
Wozniacki, the former world No 1, has been in dreadful form in the past year, and arrived in Paris on the back of four straight defeats on clay.
Robson recently took the scalp of Agnieszka Radwanska and gave Serena Williams a decent game on clay in Madrid.
That led to high expectations of an upset, but Robson folded in hugely frustrating fashion, unforced errors and double faults at crucial times giving Wozniacki an armchair ride into the second round.
Robson had a break point in the first game, which Wozniacki saved with an ace, and two more in the Dane's next service game, which she squandered.
Robson then lost her serve, throwing in a double fault on break point as Wozniacki went 3-1 up.
Back came the Brit, a superb backhand down the line and aggressive shots from the baseline earning an immediate break back.
But in the next game unforced errors and - once again on break point - a double fault, gifted Wozniacki a 4-2 lead which quickly became 5-2.
Robson held serve and had Wozniacki sweating at 30-30 in the next game but the Dane held her nerve to serve out for the set.
Another Robson double fault handed Wozniacki a break point in the first game of the second set but this time the tenth seed helped her out and hit long, the Brit winning a marathon game.
Wozniacki had no such problems in her service games, winning it to love to heap the pressure back on Robson.
She was looking good at 30-0 but then the wheels came off. Some poor backhands, and some winners from Wozniacki saw Robson lose her serve again - 1-2.
Wozniacki held, and then broke Robson again, all aspects of the Brit's game now crumbling.
Just for one game, all the pieces of the Robson game came together. From 40-0 down she fought back to win the game and pull a break back, her powerful forehand to the fore.
That was as good as it got. She was broken to 15 in the next game and Wozniacki served out with ease to book her place in the second round.