Marseille and PSG were able to cut the gap on Ligue 1 leaders Lille after they were held at home to Lyon.
Lille remain one point ahead of third-placed Marseille after they failed to build on an early lead against Lyon which would have consolidated their position at the top.
The Ligue 1 leaders raced to an early lead when Moussa Sow scored from close range after Adil Rami had flicked on the ball from a well-worked set-piece.
But Lyon themselves have hopes of still figuring in this Championship race and were level after 26 minutes when Kim Kallstrom hit a stunning shot from outside the area.
Lyon are now just four points behind Lille in the table.
Julien Feret gave Nancy an opportunity to claim their second win in six games when he fired a left-foot drive into the top corner after 34 minutes against Marseille.
But then Andre Ayew took centre stage as he slotted home from close range after Stephen Mbia had flicked on a corner.
With the game heading towards a draw, Ayew popped up three minutes from time to score from close range again.
PSG moved up to fourth with a 2-1 win over Toulouse and are now just two points behind Marseille.
Two goals in the first half effectively sealed the points for them, with the first coming from in-form Sylvain Armand as he finished off a clever set play with a neat finish a minute shy of the half hour.
Mathieu Bodmer gleaned the second nine minutes later from close range to put them in the box seat.
Franck Tabanou halved the arrears for Toulouse with a sweet left-foot strike just after the hour mark but they were unable to find the vital equaliser.
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