Bordeaux Begles gave another demonstration of their Top 14 title credentials with a bonus-point win over Clermont Auvergne.
Top 14 leaders Bordeaux-Begles have agreed a two-year deal with Ben Lam, who will join from the Hurricanes at the end of the campaign.
Racing 92 stretched their Top 14 winning run to five matches with a dramatic defeat of Toulouse.
Lyon surrendered first place in Top 14 as they lost away to Bordeaux-Begles, who won a contest that was closer than the scoreline suggests.
Bordeaux-Begles, nudged into second on Saturday, could not return to the Top 14 summit at Toulouse.
Top 14 front-runners Lyon won again, while La Rochelle's Arthur Retiere grabbed a hat-trick and Brive left it late.
Stade Francais came into the Clasico sitting bottom of the Top 14, yet they pulled off a thrilling win in Paris as Toulouse wilted.
He may have been granted an early release by Toulon, but Rhys Webb will not play for them again if owner Bernard Lemaitre has his way.
High-flying pair Lyon and Bordeaux Begles celebrated contrasting victories in Top 14 action on Saturday.
Having been granted an early release from his Toulon contract, Rhys Webb has agreed a return to Ospreys in 2020.