banana skin
n.— «Italy are a good side—they won two games in the Six Nations and pushed Ireland in the warm-ups and most of them have beaten Scotland before. This, therefore, is not a “banana skin”; it’s what the French call a seizième-final, the round before the last eight, rather like the match we won against Fiji, 22-20, in Sydney in 2003.» —“Sportblog: Five things the Scots must get right” by Gregor Townsend Guardian Unlimited (United Kingdom) Sept. 29, 2007. (source: Double-Tongued Dictionary)
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