Doomsday survived being blown into nothing but a skeleton by the all powerful Impirex. He survived being teleported to the end of time where nothing exists. He survived being stuck in an infinite loop of being teleported to three different places at once. Meanwhile, Hulk has been taken down by tranquilizers before. Doomsday will simply develop some sort of natural tranquilizer that calms the Hulk and when Hulk reverts to Banner, SPLAT!!
I even remember Wizards list of the deadliest villains of all time and what would happen if they faced off. Doomsday was near the top, only beaten by guys like Magneto and Lex Luthor because they would be smart enough to teleport Doomsday someplace else and make him "somebody else's problem". Nobody in that entire list (all powerful guys like Galactus and Darkseid--who already had his ass kicked by Doomsday-rather easily, I might add) would beat Doomsday in a physical contest. Hulk foe, The Abomination, didn't even make the list.
If I'm not mistaken, in the list of most powerful heroes, Hulk was beaten by Silver Surfer, Thor, Superman, Wonderwoman, Firestorm, Doc Strange, Spawn, Flash, AND Professor X. They even explained how each person would beat Hulk, based on their history, strengths, and weaknesses. Hulk is powerful (Just read World War Hulk to see how powerful....) but, like I said, Doomsday would kill him!
