Marseille kept their slim Ligue 1 title hopes alive with a 1-0 victory at home to Brest on Saturday.
Marseille, who trail leaders Paris Saint-Germain by six points, needed to win to hold on to second place after Lyon accounted for Montpellier 2-1 on Friday.
Benoit Cheyrou scored the winner in first-half stoppage time with a superb free-kick that curled into the net off the near post.
"We have improved in our weak moments," Marseille coach Elie Baup said.
"At the start of the season, we had less control in those weak moments. Now, we stay calm. We manage to keep the ball a bit better when we feel that we can't trouble our opponent."
Brest, who slumped to their sixth straight loss and have won just one of their past 13 games, are three points adrift of league safety.
"We must keep on fighting until the end of the season," Brest coach Corentin Martins said.
"As long as we have a chance mathematically to escape relegation, we will hang tough."
Marseille travel to Lorient next up, while Brest play host to Rennes.