Rennes' hopes of claiming the third UEFA Champions League spot in France were dented by a last-minute equaliser from Paris Saint Germain.
In-form Rennes took the lead midway through the second half through Kim Kallstrom (71), and it appeared as though Laszlo Boloni's men would claim their ninth win in 10 games.
However, Bonaventure Kalou struck in the 90th minute to spoil Rennes' party and leave them one point adrift of Lille in third, with two games of the season remaining.
Marseille boosted their chances of qualifying for the Uefa Cup with a hard-fought 2-1 victory over Auxerre.
Mamadou Niang (15) fired L'OM into an early lead, before their advantage was doubled by Renato Ciwelli (68).
Auxerre hit back quickly, Jean-Pascal Mignot (77) reducing their arrears, but Marseille held on for the three points.