According to the book "A Pictorial History of Wrestling" (by Graeme Kent in 1968) the tough British wrestler Bert Assirati defeated the boxer Arnold Corley in a boxer vs. wrestler contest. General information about Assirati you can find on www.bertassirati.com . A very remarkable wrestler and athlete.
Interesting snippets of history, shows that despite MMA fighters having the advantage, always be wary of a boxer!