An "in and out fighter" is a term for boxers who win when they aren't expected to, and then lose when they figure to win. A couple of older examples would be Iran Barkley and Junior Jones. The closest to one now that I can think of is Nate Campbell.
Anyone have any other names that fit this category?
Nigel Benn.
Big favourite against Watson, Eubank (1st), Malinga and Collins.
Big underdog against DeWitt, Barkley, Galvano, Eubank (2nd) and McClellan.