Saturday sees four European Rugby Challenge Cup showdowns, with Cardiff, Exeter, Connacht and Gloucester all in action.
Clermont sit on top of the Top 14 table as they became the first visiting team to taste victory at Oyonnax this season.
A Matt Giteau-inspired Toulon should win the Top 14 with some attractive rugby, says Dewi Morris.
Clermont returned to the summit of the Top 14 standings in style while Castres climbed out of the relegation zone.
Toulon were beaten at home by Stade Francais, while Racing Metro, Bayonne and Oyonnax all earned victories.
Champions Toulon, Brive, Clermont, Lyon, Grenoble and Stade Francais were all winners in the Top 14 on Saturday.
Rupert Cox reviews the weekend's rugby including the hotly-contested Top 14 in France.
Alipate Ratini scored a magnificent hat-trick to lead Grenoble to a first win of the season, 37-23 over Bordeaux-Bègles.
Saracens are expected to maintain their winning start to this season's Champions Cup campaign when they host Oyonnax.
Les Kiss has made eight changes to his Ulster team for Sunday's Champions Cup clash with Oyonnax.
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