Oyonnax, with second five Roimata Hansell-Pune and No 8 Viliami Ma'afu in the ranks, upset Jake White's Montpellier - featuring Anthony Tuitavake, Rene Ranger and Tom Donnelly - 20-13. Toulon's pack counted the departing Carl Hayman, Ali Williams and Chris Masoe in their 32-23 win over Racing-Metro.
In England's Aviva Premiership, Sale Sharks captain Daniel Braid, playing at blindside flanker, scored a try as the Sharks beat the Northampton Saints 20-7. In the midfield for the Sharks were Sam Tuitupou and Johnny Leota, while new signing, loose forward TJ Ioane, had his first outing off the bench.
Alapati Leiua and former Auckland loose forward Nathan Hughes scored tries for Wasps, but to no avail as they went down 39-26 to Bath.
A try to former Manu Samoa, Wellington and Hawkes Bay wing Sinoti Sinoti helped his Newcastle Falcons defeat winless London Welsh 38-7, for whom Piri Weepu played at No 10.
Former North Harbour first five Ben Botica's four goals were key to Harlequins' 32-12 result over Leicester.
In the Guinness PRO12, first five Jimmy Gopperth scored a try and kicked a conversion in Leinster's 22-13 win over Mark Hammett's Cardiff Blues.
Not helping matters for Cardiff was a red card to Jarrad Hoeata for a dangerous tackle on Leinster fullback Rob Kearney.
Gareth Anscombe slotted three goals for Cardiff, who have signed Steelers and Hurricanes midfielder Rey Lee-Lo once Super Rugby is done for 2015.
Scarlets' new signing Hadleigh Parkes turned out on the wing in the 22-7 loss to Glasgow.
In Treviso's 20-24 reversal to Ulster, former Waikato No 10 Sam Christie scored a try, while former Taranaki and Western Force utility Jayden Hayward kicked four goals.
Former Blues and Northland loosie Dean Budd played at No 8 for Treviso.
The stakes ramp up considerably this weekend, which sees the fifth, and penultimate, round of the European Champions Cup and second tier Challenge Cup.