La Rochelle continued their strong home form when dishing out a 41-16 beating to a Castres side who were in the Top 14 final last season and won it the year before.
The hero of the night for La Rochelle was 38-year old Sereli Bobo, who crossed for two more tries as the Fijian finds a new lease of life on the Atlantic coast.
La Rochelle, winners over Toulouse at Stade Marcel Deflandre last time out, led 19-9 at the break and were always in control.
They host Bordeaux tomorrow looking for a third home win, having lost all three on the road.
Bayonne were also home winners at the weekend, seeing off Brive 23-6, with Joe Rokocoko and Simon Labougrie getting tries.
The remarkable feature of this game was Brive receiving four yellow cards before the hour mark. Bayonne are away to Bernard Jackman's Grenoble tomorrow.
Exeter were brought crashing back down to earth after their 52-0 away win over London Welsh when they were defeated 24-20 at home by Leicester at Sandy Park.
Exeter led 17-13 at the break thanks to tries from David Ewers and Haydn Thomas but Leicester, who had not been behind at the break in a Premiership game since last January, carved out the win in the second half.
Exeter travel to Gloucester this evening bidding to improve on their fourth place spot against David Humphreys' men, who defeated Sale last weekend after being hammered by Northampton.