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The skipper produced a blunder when he was next called upon, however, fumbling the ball into his own net to give Evian a 1-0 lead in the 29th minute.
Metz looked a little lacklustre going forward, but that all changed on the stroke of half time when Ferjani Sassi found Bouna Sarr, who tucked into the bottom corner with his right foot to bring the scores level.
Mathieu Duhamel should have put Evian back in front after the interval, but instead he somehow saw his shot saved by Carrasso at point-blank range.
Evian finally took a chance to go ahead and it proved to be the match-winning goal as Sunu finished confidently having been picked out by the enterprising Thomasson.