Bernardo Silva's goal was his first for Monao
Ligue 1's top two teams, Marseille and Paris St-Germain, both lost 1-0 to open up the title race.
Lyon now trail Marseille by only one point and PSG by two after their 3-0 win over Caen on Friday.
Champions PSG lost their first league game of the season as Jeremy Pied scored Guingamp's only goal.
Marseille were beaten by Monaco, last season's runners-up, Bernardo Silva scoring from 16 yards out after a dummy from Yannick Ferreira Carrasco.
Monaco, who cut costs during the summer, moved up to sixth in the table with victory at Stade Louis II.
Marseille handed a debut to 16-year-old Bilal Boutobba late on.
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- Published12 December 2014
