Marseille routed Montpellier 4-0 to climb atop the French league on Saturday.
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The defending champion tops the standings on goal difference with 25 points from 14 matches, level on points with Lille which drew 1-1 with Bordeaux.
Paris Saint-Germain could take the top spot if it beats Lyon on Sunday.
Argentine playmaker Lucho Gonzalez opened the scoring for Marseille in the 20th minute. Brazilian forward Brandao knocked the ball down for Gonzalez, who fired home a half-volley.
Benoit Cheyrou doubled the lead in the 28th with a long-range strike that deflected off a Montpellier player.
Mathieu Valbuena added a third goal in the 65th with an assist from Gonzalez before Loic Remy grabbed a fourth in stoppage time.
"It’s a very good result. We’re sending a strong signal to ourselves," Marseille coach Didier Deschamps said. "Since the beginning of the season, we haven’t often had the match under control at home, but that was not the case tonight."
Marseille fullback Cesar Azpilicueta tore the anterior cruciate ligaments in his left knee in the first half and will be sidelined for about six months.
Also Saturday, it was: Lorient 2, Rennes 0; Nancy 1, Saint-Etienne 1; Monaco 1, Nice 1; and Valenciennes 3, Arles-Avignon 0.
The match between Brest and Lens was suspended at halftime because of a snow-covered pitch.
On Sunday, Auxerre hosts Toulouse and Caen faces Sochaux.
Bordeaux salvaged a point with an own goal from Lille defender Adil Rami, who turned into his own net a free kick from Jaroslav Plasil in the 51st.
Moussa Sow initially put Lille ahead in the 36th, diverting in a backheel flick from Rami to notch his 10th goal this season.
In Lorient, midfielder Alaixys Romao followed up to score in the 61st after Rennes goalkeeper Nicolas Douchez had stopped a drive from Morgan Amalfitano. Jeremy Morel sealed the win in the 86th.
In Nancy, Marama Vahirua fired a free kick into the top corner to equalize for the hosts in the 67th after Loic Perrin had volleyed home a rebound for Saint-Etienne in the 51st.
In Monaco, Park Chu-young converted a penalty kick in the 76th after Julien Sable had fouled Dieumerci Mbokani. But substitute Eric Mouloungui leveled in the 84th for Nice.
Nice was down to 10 men in the 25th when defender Drissa Diakite was red-carded for a foul on Mathieu Coutadeur.
In Valenciennes, Gregory Pujol outpaced the defense to collect a long pass from Jose Saez and score with a lob in the 20th.
Carlos Sanchez dribbled past goalkeeper Cyrille Merville to slot into an empty net in the 77th and Gael Danic made it 3-0 with a diagonal shot in the 83rd.