My predicitions just a wild guess, but i'm going with Tyson because Lewis has such a weak defence he showed that in the first Rahman fight.
If Tyson gets past Lews and lands a few upercuts, then i thnk Lewis'll be out for the count.
If Lewis just tries to dominate with jabs and good defence, then its lightly he'll win on points. - I dont wanna see a boring fight though!