I'll defer to Stonehands' excellent post. Lewis was a difficult proposition for even the best of them, but as far as heavyweights go, Muhammad was the greatest. Most of Lennox' rights would be evaded; the rest would be absorbed. The jab could potentially hurt Ali. Ali wouldn't be able to work around it if they were to jab at the same time, Lewis himself a good jabber. However, as addressed by Stonehands, workrate is a big factor and Lewis' output was far below Ali's. I don't dismiss either fighter's chances. This will be a close affair for however long it may last. If the kayo should happen though, I guarantee Ali will be the one in an upright position. Lennox will be tested late, and I allot next to no thought, honestly, on a Lewis win by way of knockout. It's highly, highly unlikely. The likelihood of a kayo is itself very low.