Fedor by submission.
Well, since they've both retired, "will" isn't really correct grammar. The fight will never happen, so it's just in the realm of theory.
Given that, odds are with Fedor. He was faster, a MUCH better striker, and in his prime, before he started falling in love with knocking people out, he was a great game-planner. He'd fought bigger guys. He'd submitted every wrestler he'd faced, including guys who were MUCH better than Carwin. The only way a prime Fedor loses is if a meteor falls from the sky and sets him on fire.
Shane Carwin
Both in there prime,I would have to give the advantage to Carwin,his wrestling abilites are just too much for Fedor to handle.
Carwin would whoop Fedor's ***, as simple as that.I mean com'on guys like werdum and bigfoot;even henderson (at light heavyweight) have destroyed Fedor. Just imagine what a 285 pound beast in Carwin would do to Fedor!! Absolute Murder!!!