Leaders Toulon are now seven points clear of Toulouse, who beat Biarritz 19-14, and Clermont.
However Toulon failed to win a bonus point in squeaking past bottom side Mont-de-Marsan 15-9 at home.
Montpellier are fourth after a 13-9 win at Agen with Castres dropping to fifth after losing 22-12 at lowly Bayonne.
Grenoble stay sixth despite being smashed 35-6 at Stade Français, who remain in contention for the play-offs in ninth.
Racing Metro join Perpignan on 38 points after a 22-15 win in Bordeaux.