No glory for Connacht's Euro rivals
Oyonnax suffered their third loss in a row in the Top 14 last weekend as Bordeaux claimed a 39-9 win at Stade Charles-Mathon, where Connacht launch their Challenge Cup run next weekend.
A red card for Maxime Veau after 43 minutes put a halt to Oyonnax's hopes of a second win of the season; it came at a point of the game where they only trailed 13-9 thanks to three Ben Botica penalties in the first half.
But after that the victors ran riot and scored an unanswered 26 points against the 14 men to claim an easy road win.
Facing Pau this weekend is another big test for Connacht's next opponents.
Elsewhere in France, Brive continue to search for their first win of the season as leaders Montpellier devoured them on a 54-10 scoreline.
Five first-half tries put Montpellier on the road to victory, while their final tally included a hat-trick for Nemani Nadolo and two for Bismark du Plessis. A try from Arnaud Mignardi was a consolation late on for Brive who face Castres next.
Worcester Warriors also sit without a win to their name so far this season after Saracens defeated them 25-3 at Sixways last weekend.
Chris Wyles ran in two tries for Saracens who led 10-0 early on, while a Jamie Shillcock penalty was Warriors' only reward. They make the short trip to Bath tomorrow and could leapfrog London Irish at the foot of the table with a win.