Clermont created a surprise by going to win at the Stade Vélodrome at the end of the 25th day of Ligue 1 (0-2).
Put in orbit by the opener of the score of Mohamed Bayo, author of his 10th goal of the season (13th), the promoted knew how to round his back to sign a big blow.
A feat achieved in part thanks to its goalkeeper Ouparine Djoco, imperial in front of the Olympian waves.
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Calendar and results Ligue 1
League 1 standings
Too imprecise, however, the locals will never have found the fault, exposing themselves to a punishment from the Gabonese Jim Allevinah, author of his first goal in Ligue 1 from a corner (84th).
With this third success in four matches, the promoted Auvergne take six points ahead of the red zone.
Regarding OM, who disappointed a Vélodrome filled with more than 50,000 supporters, Nice came back to a small point from second place after their victory against Angers earlier in the day (1-0).