There were wins for Clermont Auvergne and La Rochelle in the Top 14 on Sunday.
Clermont Auvergne could only draw with lowly Grenoble and Toulouse took advantage by putting Bordeaux-Begles to the sword in the Top 14.
Three-time European champions Toulon have been struggling in the Top 14 and lost to La Rochelle on Sunday.
Having been beaten 82-21 by La Rochelle six days earlier, Enisei were once again outplayed by the French club.
Worcester Warriors had lost 11 away games in a row in the Challenge Cup, but ended that sequence with a brilliant showing in Paris.
Clermont's advantage at the summit of the Top 14 table was reduced to four points after they were beaten at La Rochelle.
Top 14 leaders Clermont Auvergne put some daylight between themselves and second-place Stade Francais on Saturday.
Clermont Auvergne remain top of the table, but they suffered a first defeat of the Top 14 campaign at the hands of Bordeaux.
Centre Gael Fickou has now scored three tries in two games for Stade Francais, the club he joined from Toulouse in May.
Clermont won an early top-of-the-table clash with Stade Francais, while there were also Top 14 victories for Racing 92, Toulouse and Lyon.
Castres overturned a 13-point deficit in the second half to beat Lyon in Saturday's Top 14 action.
Clermont Auvergne ran hot at the start of the new Top 14 season as the two promoted sides came up short in their opening...
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Ahead of the opening round of fixtures in the 2018-19 season, we pick out some of the best statistics surrounding the Top 14.
Jono Gibbes will remain with Waikato until November, when he will head to France to start work with La Rochelle.
Racing 92, Lyon and Castres got the play-off outcomes they were hoping for in Top 14, while Stade Francais stay up despite suffering defeat.
Racing 92's bonus-point win over Bordeaux-Begles gives them the slenderest of advantages over Toulouse with one match to play.