Bayonne kept the pressure on Wasps in Amlin Challenge Cup Pool 3 in the with a 12-6 victory over French rivals Bordeaux-Begles on Thursday.
The win provisionally moves the Basque club three points clear of Wasps, who travel to Italian side Rovigo on Saturday.
Fly-half Benjamin Boyet kicked all of Bayonne's point with four penalties as they claimed their fourth victory from five games in the tournament.
The visitors held a 6-3 lead at half time as UBB replied Boyet's two early penalties with one from replacement Manu Saubusse shortly before the interval.
The second half followed the same pattern as Bayonne completed the double over their French rivals.
Pens: Saubusse 2
Pens: Boyet 4
Bordeaux-Begles: 15 Laurent Ferreres, 14 Vunga Lilo, 13 Charles Brousse, 12 Michel Denetre, 11 Darly Domvo, 10 Nicolas Sanchez, 9 Julien Seron, 8 Hugh Chalmers, 7 Louis Madaule, 6 Charlie Ternisien, 5 FranÃ§ois Tisseau, 4 Andrew Chauveau, 3 Jacobus Roux, 2 Fabien Rofes, 1 Franck Labbe.
Replacements: 16 Hikairo Forbes, 17 Ricky Davies, 18 Patrick Toetu, 19 Adam Jaulhac, 20 Matthew Clarkin, 21 Manu Saubusse, 22 Blair Connor, 23 Rafael Carballo,
Bayonne: 15 Clement Lagain, 14 Marvin O'Connor, 13 Thibault Lacroix, 12 Sam Gerber, 11 Joe Rokocoko, 10 Benjamin Boyet, 9 Cedric Garcia, 8 Marc Baget, 7 Julien Puricelli, 6 Jean-Jo Marmouyet, 5 Troy Flavell, 4 Dwayne Haare, 3 Renaud Boyoud, 2 Francois Da Ros, 1 Vitolio Manukula.
Replacements: 16 Denis Avril, 17 Nemiah Tialata, 18 Clement Baiocco, 19 Robin Linde, 20 Francois Carillo, 21 Julien Audy, 22 Mike Phillips, 23 Sione Lauaki,.
Venue: Stade Andre Moga, Begles
Referee: Carlo Damasco