Scrum-half Bales kicked three penalties at Stade Marcel Deflandre and converted all four home tries – one of which he scored himself to make the score 27-9 with just under half an hour remaining.
This was a sixth consecutive reverse for the visitors, but they had threatened to end that run in the second half before fading.
Castres led by 12 when Anthony Jelonch’s try early in the second half was converted, but Agen came roaring back and scored through Denis Marchois, Mathieu Lamoulie and Filipo Nakosi in quick succession to take a 28-21 lead.
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