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Algerian international midfielder Boudaoui turned in Romain Perraud's low cross for the only goal of the game in the 74th minute after Gaetan Laborde had failed to convert a first-half penalty for the visitors.
Boudaoui won the spot kick when he was brought down in the box by Alidu Seidu, but Laborde blazed the penalty over the bar. Boudaoui's strike meant Nice were already provisionally at the top of table.
Nice are fighting against Monaco and are also ahead of Paris Saint-Germain in third, with the reigning champions visiting Brest. Under their 34-year-old Italian coach Francesco Farioli, Nice are unbeaten 10 games into the season, having claimed six wins and four draws.
They have won 1-0 in four of their last five games and have kept seven clean sheets in eight outings, the exception being their 3-2 victory away at PSG.
