Holger Rune, ranked 70th in the world, was faced with a difficult task on paper in the form of German world three Alexander Zverev, who won the Olympic tournament this summer.
But the Dane stood for a full-fledged effort.
The 18-year-old went up to 3-0 immediately and eventually won the first set 6-3.
The second set was an even more pleasant trip for Rune who took it home with 6-2.
Afterwards, as expected, he was very pleased with his achievement.
- It feels great.
I played focused, almost kept to the tactics and when I would serve home the match, I tried to think that I played a Challenger tournament (the level below ATP) and that I did not meet the world three, he says to Ekstrabladet.
Rune will face the winner between Emil Ruusuvuori and Maxime Creesy in the next round.
CLIP: Novak Djokovic juggles Neymar (April 12)
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Djokovic and Neymar met in Monte Carlo Photo: ATP Media