Marseille moved up to fourth in the Ligue 1 standings when a second-half strike by substitute Morgan Sanson earned them a 1-0 win at Racing Strasbourg on Friday.
Sanson's half-volley in the 72nd minute put Marseille on 18 points from nine games, bringing some comnfort to the Provence club after they slumped to a record 12th consecutive Champions League defeat with a 3-0 loss to Porto on Tuesday.
In a dull game, Strasbourg had a clear chance just before the hour but Anthony Caci's fierce strike struck the bar.
Strasbourg remain second-bottom on six points from 10 games.
Marseille are unbeaten in 13 away games in Ligue 1.
Paris St Germain, who host Stade Rennes on Saturday, lead on 21 points, two ahead of Lille who were the only French club to bag points in Europe this week when they won 3-0 at AC Milan in their Europa League group stage match on Thursday.