Gustavo Kuerten rolled back the years to beat top seed Roger Federer in the third round of the French Open.
Kuerten, champion at Roland Garros in 1997, 2000 and 2001, produced the sort of form that has largely eluded him since he underwent hip surgery in 2002.
World number one Federer was nowhere near his best but Kuerten never allowed him to find a rhythm.
Kuerten ran out a 6-4 6-4 6-4 winner and will now face Spaniard Feliciano Lopez in the last 16.
The match started with three straight breaks, two of them on Federer's serve.
But Kuerten soon settled down and served out the first set, and from then on was in control throughout.
The Brazilian 28th seed took an early break in each of the second and third sets, and Federer was unable to fashion a single break-point.
Kuerten's remarkable win leaves the top half of the draw wide open, with eighth seed David Nalbandian now the highest seed in that section.
Kuerten said he had had no expectations coming into the tournament.
"For me it is just a
pleasure to be here because I didn't expect to play, the way my
physical condition has been. It's unbelievable," said the 28-year-old.
Federer admitted that he had not played up to his usual standard but had no excuses for his defeat.
"He served good and was better - that's all," said the Swiss player.
"I was struggling with my footwork and I lost my confidence.
"Now I'm just looking forward to getting out on the grass," added the Wimbledon champion.