Marseille climbed into second place in the Ligue 1 table with a 2-1 victory over title rivals Paris St Germain at the Stade Velodrome.
Andre Ayew scored the decisive goal in the 35th minute after Gabriel Heinze's early opener had been cancelled out by Clement Chantome.
The win continued Marseille's late-season surge that has now seen them win six of their past seven league games to move them four points behind leaders Lille.
The only defeat in that run came against Lille last time out at the Velodrome, while their exit from the Champions League at the hands of Manchester United in midweek left them under some pressure to secure victory.
Nancy eased their Ligue 1 relegation fears as Andre Luiz's early goal gave them a 1-0 win over a Monaco side who proved to be their own worst enemies.
Luiz headed the 19th-minute winner but Monaco had a host of chances to force their way back into the game, none better than the penalty missed by Chu-Young Park just before half-time.
Victory lifted Nancy six points clear of the relegation zone which still cages Monaco, who are three points adrift of 17th-placed Auxerre with ten matches remaining.
Caen left it late but eventually saw off the challenge of Ligue 1 basement side Arles 2-0 to give their own relegation troubles a welcome boost.
Arles proved stubborn opponents at the Stade Michel d'Ornano, but succumbed in the final 13 minutes to goals from Yohan Molle and Youssef El Arabi.
The result lifts Caen six points clear of the bottom three, but Arles are 21 points adrift of safety and, with matches running out, it seems a question of when - not if - they will return to Ligue 2.