Paris Saint-Germain are top on 25 points with Marseille a point behind and four clubs, Lille, Lyon, Monaco and Montpellier all on 23.
After a defeat and a draw in their last two games PSG face the prospect of being knocked off top spot with a tough away clash at Montpellier on Saturday while fellow front-runners Lille and Monaco face-off on Sunday.
After the weekend Marseille will have two games in hand on all of them, and a Champions League game with Man City coming up in midweek.
"This group is starting to show some collective force," Marseille's coach Andre Villas-Boas.
"We have got our confidence back. And we can have a go at Monaco and Rennes in our coming games," he said.
Argentina's Dario Benedetto got OM's opener Friday with a classic centre-forward's control on the chest and a flying snap-shot as the former Boca Juniors forward produced a second goal from consecutive outings after a 15-match personal dry patch.
Nimes were down to 10-men before Valere Germain wrapped up the precious three away points.