Sale started their search for a third Amlin Challenge Cup crown with a comfortable 33-10 win over 2012 champions Biarritz in Salford.
Biarritz came through a tough Top 14 encounter with Agen to post a tight 16-11 win at their Parc des Sports Aquiléra.
Clermont Auvergne comfortably beat Biarritz 19-12 in their Top 14 clash at the Stade Marcel-Michelin to go joint top of the table.
Bayonne fly-half Benjamin Boyet kicked a last-gasp winning penalty as Biarritz suffered a surprise 16-15 home defeat.
Dimitri Yachvili's 75th-minute penalty ended a gallant Amlin Challenge Cup quarter-final fightback by Wasps as they lost 26-23 to Biarritz.
Round-up: Saracens were made to sweat before eventually overcoming Treviso 26-20 to secure their place in the Heineken Cup quarter-finals.
All the team news ahead of the final round of Heineken Cup pool matches.
Clermont overcame a 14-point first half deficit to defeat Biarritz 27-17 and book a place in the Top 14 semi-final.
Castres held their composure to seal a 16-13 victory over their play-off rivals Biarritz at the Stade Pierre-Antoine.
Round- up: Paul Sackey touched down twice as Toulon beat league leaders Toulouse 21-9 at Stade Mayol to keep their play-off hopes alive.
Montpellier eased to a 26-6 victory over 14-man La Rochelle to go top of the Top 14 for the first time in their history.
European Challenge Cup
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