Adam Walton stuns former No. 1 Daniil Medvedev at French Open - ESPN

PARIS — Australian Adam Walton, the 97th-ranked player who received a wild-card invitation into the French Open, beat former world No. 1 Daniil Medvedev in a five-set, first-round match in unusually hot conditions at Roland Garros on Tuesday.

Walton prevailed 6-2, 1-6, 6-1, 1-6, 6-4 in a match that took 3½ hours to complete.

For a third consecutive day, the temperature in Paris was forecast to rise to at least 32 degrees Celsius (90 Fahrenheit), making net-rushing — which is usually better reserved for hard and grass courts — a viable option because the court is drying out quicker and playing faster.

Medvedev, the No. 6 seed, made four consecutive errors in the deciding game while on serve, including a double fault, to give Wilson his first career victory against a top-10 player.

It was Medvedev's second straight first-round exit here and third in four years.

«I know why I don't really play my best in Roland Garros, but if I say it, it's (making) excuses,» Medvedev said. «So I keep it to myself.»

In other matches, Stefanos Tsitsipas, the 2021 runner-up to Novak Djokovic, was leading 6-2, 3-0 against Alexandre Muller when his French opponent retired with a right calf injury.

Muller wiped away tears as he left the court, with the injury coming three months after he hurt his left calf.

Alexander Blockx, meanwhile, withdrew from the tournament with a right ankle sprain, making Alex de Minaur — his scheduled second-round opponent — the first player into the third round.

Top-ranked Jannik Sinner, looking to extend his 29-match winning streak, opens against French wild card Clement Tabur later Tuesday.

Britain's Cameron Norrie, the No. 20 seed, retired midmatch for just the second time in his professional career in the opening