The Senegalese struck after 25 minutes and former Liverpool striker Djibril Cisse grabbed a second with 15 minutes remaining to break the home side´s 13-match unbeaten league run and move OM up to fifth.
Nice had not lost in Ligue 1 since October and were undefeated at home in over a year, but they had no answer to Marseille´s strike partnership at Stade du Ray, which had blitzed Caen 6-1 last time out without Niang.
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