Monaco cut Paris Saint-Germain's lead at the top of Ligue 1 to just three points on Sunday night as they claimed derby honours against Marseille at the Stade Louis II.
Claudio Ranieri's side may have to cope without injured Colombian striker Radamel Falcao for the rest of the season due to his knee injury, but even in his absence they had enough firepower to finish off their off-form visitors.
Monaco won 2-0, with Valere Germain netting a classy opener after a burst from the left flank in the 41st minute and Emmanuel Riviere adding the second goal after 57 minutes.
Paris Saint-Germain had stuttered on Saturday night, being held 1-1 by Guingamp.
Bordeaux stand sixth after overcoming fourth-placed Saint-Etienne 2-0 at Stade Chaban-Delmas.
A midweek Coupe de France defeat to amateur side L'Ile Rousse had brought a rebuke from the boardroom for Bordeaux's under-performing players but there would been no complaints about a solid home win, secured by goals from Abdou Traore and Henrique.
Lyon made it three Ligue 1 wins in a row for the first time this season with a comfortable 3-0 defeat of 10-man Evian at the Stade Gerland.
Bafetimbi Gomis scored his eighth goal of the campaign to set the hosts on their way before Alexandre Lacazette effectively wrapped up all three points with goals either side of the break to move the former champions to fifth place - their highest league position since September.