Malo Gusto was the hero for Marseille and Lyon's villain on Sunday evening as the defender scored a stoppage time own goal to gift the visitors victory.
Gusto came off the bench in the 80th minute to try and sure up Lyon's defence as they sought to hold on for a point, but instead saw his final touch turn the ballpast goalkeeper Anthony Lopes and into the net.
Cengiz Under initially put Marseille in front at the Groupama stadium before former Arsenal striker Alexandre Lacazette pulled Lyon level.
Both side's looked set to share the points available before 19-year-old Gusto's calamitous late error.