An early own goal by Sylvain Armand was enough for Le Mans to claim all three points against Paris St Germain, although it came too late to save Arnaud Cormier's side who have already been relegated from Ligue 1.
Le Mans' fate was sealed following defeat at Nancy on Wednesday night as their five-year stay in the top flight came to an end and today's victory was bitter-sweet with Moussa Narry sent off in injury time at the end of the game.
The hosts had little to play for other than pride today but they dominated the first half with Armand making a last-ditch clearance following shots by Anthony Le Tallec and Roland Lamah.
However, after just eight minutes the same player turned villain. Le Tallec went past Mamadou Sahho and prepared to shot but Armand accidentally deflected the ball into his own goal.
Le Mans almost doubled their lead midway through the half when Le Tallec released Modibo Maiga and he controlled and shot with the ball coming back off the right post.
Maiga was then one on one with Gregory Coupet but the keeper repelled him.
However, PSG responded in the second half, Mevlut Erding's snapshot drawing a save from Didier Ovono with the goalkeeper also blocking Claude Makelele's effort.
Again the keeper was on form, blocking Clement Chantome's shot from 12 yards.
And although Le Mans held on to claim their sixth home win of the season, the success was slightly clouded by on-loan Auxerre midfielder Narry's sending off for a tackle from behind on Younousse Sankhare.