Pool 3 leaders Pau maintained their 100 per cent European Challenge Cup record with a bonus-point 26-12 victory over Top 14 rivals Agen.
Pau ran out 40-21 winners when the two sides locked horns last Friday and struggling Agen were unable to gain revenge at Stade du Hameau six days later.
Lucas Rey and Benson Stanley scored tries in a first half played in driving rain as the home side took a 14-0 advantage into the break.
Yoan Tanga ploughed his way over early in the second period to give Agen hope and added a second try late on, but Sean Dougall and Laurent Bouchet dotted down at the other end to claim the extra point in a feisty contest.
Pau are eight points clear of second-placed Gloucester, with Agen a further six points back.