One of the great action fights that will probably never happen.
Both guys have great chins and love to prove it.
Leben has a size adv, but does not have great power, Shlemenko also does not have great power, but has a pretty clear skill adv.
If anyone were to finish the other I'd roll Leben, but Lombard, despite battering the Russian for 2 rnds could not put him away. And Leben would have a much tougher time finding the mark. So despite the fact that these are both straight sluggers, I'd expect this to go to decision on the strength of both of their chins.
And when 2 sluggers go at it, without a finish, u gotta role with the more technical of the 2. Ruskie via decision.