Gael Fickou ran in two tries for Stade Francais as they bounced back from their loss to Clermont Auvergne by beating Toulon 37-10 in the Top 14.
France international centre Fickou moved to the capital ahead of this campaign after six years with Toulouse and he crossed in the 42-20 reverse to Clermont in the third round of games.
He claimed a first-half brace against Toulon on Sunday, while Laurent Panis and Hugh Pyle also went over in a comfortable Stade Francais victory.
In Sunday's other game, La Rochelle became the latest club to inflict a defeat on Perpignan, who, like Grenoble, are still winless in this year's competition.
La Rochelle only held a 10-3 advantage at the interval, but three of their five tries came in the final 11 minutes as they also sealed a 37-10 success.
