In their primes, Bonecrusher of the mid 80s, Mercer of the first half of the 90s.
Both were tough and solid boxers, who could brawl. I'd pick Bonecrusher to score a close decision victory.
James Bonecrusher Smith vs Ray Mercer
Re: James Bonecrusher Smith vs Ray Mercer
Smith by majority ot split decision.
Re: James Bonecrusher Smith vs Ray Mercer
Bonecrusher would out-brawl Mercer on the outside behind his long jabs and right hands to take a decision in 10 and 12 rounds fight.