Stade Francais remain in the Top 14 play-off picture after a backs-to-the-wall victory over Bordeaux.
The Parisians had Sergio Parisse sent off in the first half but they still managed to come out on top.
Toulon remain top of the pile, though, after they bounced back to thump Montpellier.
Clermont ran seven tries past Mont-de-Marsan for an easy win while Racing Metro scraped to a narrow win at home to Bayonne.
Grenoble maintained their unbeaten record on home soil with victory over Agen, while Biarritz kicked themselves to victory over Castres.
Stade Francais 30-14 Bordeaux-Begles
Stade Francais claimed the spoils in a game rife with controversy although the hosts deserved to win.
Italy skipper Sergio Parisse was sent off in the first half for allegedly insulting referee Laurent Cardona - a charge he denies.
Stade led 24-6 at half-time but the last of their three tries was scored after the Parisians took a quick throw-in with the wrong ball, which the referee failed to notice.
Julien Rey's second half try for UBB was too little, too late as home scrum-half Julien Dupuy's 100 per cent record with the boot kept the scoreboard ticking for the home side.
Clermont 56-3 Mont-de-Marsan
Clermont climbed back into second place with an easy bonus-point win that leaves them six points behind Toulon but five ahead of Toulouse.
Clermont led 21-3 at half-time with Gerhard Vosloo, Raphael Chaume, Jamie Cudmore, Naipolioni Nalaga, Lee Byrne, Loic Jacquet and Kevin Senio all crossing.
Racing Metro 15-10 Bayonne
Racing Metro claimed their fifth consecutive win to keep pushing for a spot in the play-offs.
Racing led 6-0 at half-time but Joe Rokocoko's 67th-minute try put Bayonne ahead.
Jonathan Wisniewski's trusty boot ensured the points for Racing, though. The bad news for Racing is the loss of Juan Martin Hernandez, who limped off injured in the first half.
A losing bonus point for Bayonne moves the Basques further away from the relegations zone since all three bottom clubs lost on Saturday.
Grenoble 27-13 Agen
Grenoble remian on course for the play-offs as they maintain their unbeaten home record, which stretches back to 2011.
Grenoble led 16-13 at half-time thanks to a penalty try awarded against the Agen scrum.
Wing Rudolf Coetzee's late try after a pin-point cross-filed kick secured victory, leaving Agen stuck in the relegation zone.
Biarritz 15-9 Castres
A last-minute penalty by Rory Kockott saw Castres snatch a losing bonus point in a game characterised by their sterility on attack, poor discipline and Biarritz's immovable defence.
Dimitri Yachvili scored all Biarritz's points, with five penalties.
Toulon 51-6 Montpellier
Toulon silenced their critics in consummate fashion with a five-try rout of Montpellier at Stade Felix Mayol.
Toulon raced to a 19-6 lead at half-time thanks to tries from skipper Joe van Niekerk and second row Nick Kennedy.
Further tries from replacement back Benjamin Lapeyre, centre Matt Giteau and 18-year-old Ivan Roux ensured a maximum haul for the hosts while Jonny Wilkinson contributed 26 points with the boot.