Monaco regained their three-point advantage at the Ligue 1 summit thanks to a 3-0 victory over Nancy.
With title rivals Paris Saint-Germain thrashing Bastia 5-0 earlier on Saturday to move temporarily level on points, Leonardo Jardim's men had to respond.
And an own goal from Tobias Badila and strikes from Bernando Silva and Thomas Lemar saw them bounce back from their Champions League defeat against Juventus in midweek and strengthen their chances of securing their first title since 2000.
Marseille dropped two points in their quest for Ligue 1's European places as they were held to a goalless draw at struggling Nancy.
Both sides hit the post and Maurice Dale had a late effort disallowed for Nancy as both teams attempted to break the deadlock but the defences held out.
A point is of some use to Nancy, lifting them above the relegation places by the same margin, but OM will see it as a missed opportunity.
It might have been worse, Faitout Maouassa striking the woodwork 14 minutes...
Nice confirmed they will finish in at least third place in Ligue 1 after dispatching Nancy 3-1 at Allianz Riviera -- guaranteeing their best league performance for 40 years.
A 21st win of the campaign keeps up the pressure on the top two of Monaco and Paris Saint-Germain, with fourth-placed Lyon now unable to catch them.
Nancy took advantage of some comically poor defending to seize a 27th-minute lead, the home side's inability to deal with a routine corner enabling Maurice Dale to tap home from...