A last-gasp try from Vincent Clerc saw Toulouse claim a 27-26 win over Racing Metro and end the Parisians' nine-game winning streak.
Lionel Beauxis converted Clerc's second score from the touchline in the final minute as Toulouse claimed a vital victory and denied Racing a 10th straight win in the process.
Beauxis also slotted over four penalties, while the hosts only try came via fly-half Jonathan Wisniewsk, who also kicked six penalties before he was sent to the sin bin in the 71st minute for a dangerous tackle.
Stade Francais 11-43 Toulon
Toulon consolidated their spot at the summit of the Top 14 standings for another week on Saturday by demolishing Stade Francais.
Under a closed roof at Grand Stade Lille Metropole - the first match in league history to be played 'indoors' - Toulon led 19-6 at half-time before breaking clear with three tries in the last 25 minutes.
Jonny Wilkinson kicked 17 points for Toulon as the league leaders ended a four-match losing streak away from home.
Perpignan 20-21 Castres
A huge result for Castres as an impressive away victory - only Toulon have won in Perpignan this term - means they hang onto fourth place.
But it's an even more significant result for Perpignan as it leaves the Catalan side six points short of the play-off zone with three rounds to play.
Castres led 13-6 at the break and controlled the game, but two tries in the final 10 minutes saved a losing bonus point for USAP, who will now focus on next weekend's Challenge Cup clash with Toulouse.
Stade Montois 17-30 Montpellier
Montpellier are still very much in the race for a home play-off but will regret not claiming a bonus point due largely to their own indiscipline.
A dust up early in the second half saw both hookers - Pieter Grobler and Charles Geli - sent off.
Francois Trinh-Duc, Lucas Gonzales Amorosino and Hamish Gard scored the tries for the visitors.
Clermont Auvergne 66-21 Agen
Clermont warmed up for next week's Heineken Cup quarter-final against Montpellier by running in 10 tries against Agen.
Wesley Fofana grabbed a hat-trick, while wings Noa Nakaitaci and Naipolioni Nalaga grabbed two scores apiece.
The performance shows that Clermont are in blistering form ahead of, while relegation beckons for Agen.
Bordeaux-Begles 39-13 Bayonne
Bordeaux-Begles are almost safe as they now have a 14-point gap on Agen.
Raphael Ibanez's team led 22-10 at the break and went on to outscore their Basque visitors by five tries to one. Flanker Louis Benoit Madaule scored two tries doe the hosts.