Italy's Matteo Berrettini plays a forehand return to Russia's Daniil Medvedev during the Monte Carlo ATP Masters Series Tournament round of 32 tennis match on Court Rainier III at the Monte-Carlo Country Club in Roquebrune-Cap-Martin, south-eastern France. AFP
The seventh seed missed two break points in the opening game and then completely unravelled, making 30 unforced errors and serving five double faults.
Medvedev did not win more than two points in any of the last 11 games and his frustrations boiled over in the second set, smashing his racquet into the court four times.
Berrettini wrapped up the double-bagel victory, the first such defeat of former world number one Medvedev's career, in just 49 minutes.
"I think it was one of the best performances of my life," Berrettini said.
"I think I missed three shots in the entire match and it is not easy against a tricky player like Daniil. I think the game plan was perfect and my weapons were working."
The former Wimbledon runner-up, now ranked 90th, will face either Joao Fonseca or Arthur Rinderknech in the last 16.
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