Rules: 20 x 20 ring 6-8oz gloves Neutral corner rule after a knockdown 15 rounds 1900-1910 style of referring, and scoring Blatant fouls give the victim of them 5 minutes to recover and after 2 warnings or fouls its a DQ You could say I like Dempsey in the early to mid rounds and Sullivan late. Dempsey was a bit of a front runner in terms of energy and punch output, Sullivan had better stamina in the later rounds. The pick or at least mine depends on how hard you think Sullivan hit, which given his competition level is hard to determine, and how durable you think Sullivan is, which is hard to decide on for the same reason. Whatever the variable is, it was considered top-notch vs. the mostly smaller and older men he fought. Dempsey, I think meet a better group of men in the prize ring, but he was also exposed a bit more, which includes some victories. An intriguing matchup. Best guess, Dempsey TKO Sullivan in 9 rounds, being floored himself.