Marseille secure goalless draw with Bordeaux
OM, without a league win since January 6, had claimed a morale-boosting French Cup victory in midweek against Auxerre, their first success under stand-in coach Nasser Larguet.
Any hopes of another win were ended in the space of five second-half minutes.
Argentinian defender Leonardo Balerdi was dismissed in the 55th minute for cynically pulling back Remi Oudin, before striker Dario Benedetto received his marching orders for a horrendous tackle on Laurent Koscielny.
But Bordeaux, on a run of four straight losses in all competitions, were poor throughout and never seriously threatened a winner, with a succession of tame long-range efforts from Hatem Ben Arfa the best they could muster.