Second seed Daniil Medvedev was stunned by qualifier Thiago Seyboth Wild in a big French Open first-round shock.
The Russian battled windy conditions, "a mouthful of clay" and the Brazilian's outstanding forehand in a 7-6 (7-5) 6-7 (6-8) 2-6 6-3 6-4 loss.
Medvedev had arrived at Roland Garros in good form and in contention for the world number one ranking.
But 172nd-ranked Seyboth Wild pounced on Medvedev's inconsistency to book a first Grand Slam second-round spot.
"I watched Daniil play since I was a junior and beating him on such a court is a dream come true," the 23-year-old, who had not played a Tour-level match this year, said.