Clermont shrugged off a spirited late fightback from Biarritz to record a 22-18 victory over the Basque outfit at Parc des Sports Aguilera on Saturday.
ASM went 13-0 ahead with a quarter of the game gone after two penalties from Brock James were backed up by a converted Regan King try.
But before the break Dimitri Yachvili sent over three points before James knocked over another penalty that was chalked off by BO fly-half Daniel Waenga, who slotted a 38th minutes drop-goal.
The second-half saw Biarritz come into their own as they scored five points through talismanic scrum-half Yachvili just before the hour mark.
However, two further penalties from James kept the hosts out of reach as a late Teddy Thomas try proved only to seal a losing bonus for Biarritz.
Tries: Yachvili, Thomas
Pen: James 6
Biarritz: 15 Paul Couet Lannes, 14 Seremaia Nakala Burotu, 13 Charles Gimenez, 12 Damien Traille, 11 Teddy Thomas, 10 Daniel Waenga, 9 Dimitri Yachvili, 8 Raphael Lakafia, 7 Benoit Guyot, 6 Joshua Furno, 5 Pelu Ian Taele, 4 Erik Lund, 3 Ben Broster, 2 Arnaud Heguy, 1 Alexandre Menini.
Replacements: 16 Jean Philippe Genevois, 17 Fabien Barcella, 18 Mathias Marie, 19 Tanguy Molcard, 20 Yann Lesgourgues, 21 Julien Peyrelongue, 22 Julen Goia Iriberri, 23 Francisco Gomez Kodela.
Clermont: 15 Jean Marcellin Buttin, 14 Sitiveni Sivivatu, 13 Regan King, 12 Benson Stanley, 11 Naipolioni Nalaga, 10 Brock James, 9 Morgan Parra, 8 Damien Chouly, 7 Julien Bardy, 6 Julien Bonnaire, 5 Loic Jacquet, 4 Julien Pierre, 3 Daniel Kotze, 2 Ti'i Paulo, 1 Raphael Chaume.
Replacements: 16 Benjamin Kayser, 17 Thomas Domingo, 18 Maxime Granouillet, 19 Gerhard Vosloo, 20 Ludovic Radosavljevic, 21 Gavin Hume, 22 Lee Byrne, 23 Davit Zirakashvili.