|Bordeaux-Begles (12) 26|
|Tries: Maynadier, Brousse, Talebulamaijaina, Guiry Cons: Bernard, Beauxis 2|
|London Welsh (3) 3|
Bordeaux-Begles inflicted a 20th straight defeat on Justin Burnell's London Welsh to go equal top of Pool Four in the European Challenge Cup.
Welsh's James Lewis was sin-binned before the hosts opened the scoring through Clement Maynadier.
Tristan Roberts hit back with a penalty, only for a Charles Brousse score to make it 12-3 at the beak.
Tries from Metuisela Talebulamaijaina and Bertrand Guiry completed Bordeaux's bonus-point win.
Coach Burnell's decision to change all 15 players following the Exiles's defeat to Newcastle just five days earlier did nothing to change their fortunes - losing every competition fixture this term.
In muddy, difficult conditions in the south-west of France neither side seriously threatened in the opening 20 minutes.
While the ball proved too slippery for Pierre Bernard to hold onto over the try line, Lewis's yellow card soon after was enough to allow the Top 14 side to edge ahead.
Hooker Maynadier touched down five minutes later and Brousse crossed in the corner after Roberts teed up Welsh's only points.
Paulin Riva was shown a yellow card early in the second half, but Welsh failed to capitalise on the one-man advantage.
Bordeaux were made to work hard for their second-half tires, with Talebulamaijaina and Guiry crossing with less than 15 minutes remaining.
Bordeaux-Begles: Lonca; Riva, Talebulamaijaina, Brousse, Blanc; Bernard, Serin (capt); Del Boulbes, Maynadier, Gomez Kodela; Le Devedec, Graham; Guiry, Chalmers, Tauleigne.
Replacements: Auzqui, Poirot, Toetu, Sa, Lespinasse, Adams, Beauxis, Aumua.
London Welsh: Elder; Stegmann, Lewis, Barkley, Crane; Roberts, Lewis; Aholelei, Morris, Cooper; Schofield, Corker (capt); McCaffrey, Thorpe, Pienaar.
Replacements: Dobson, Reeves, Gilding, McNally, Browne, Rowley, Awcock, Kear.
Referee: Gary Conway (Ireland)