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Junior Dos Santos is a great first fight for the newly-crowned heavyweight champ. They are both similarly matched in many ways:
Both aren't huge heavyweights. In fact, they are part of the new crop of big men that have the size and athleticism to last for deep rounds without getting exhausted.
Both are great strikers, but Dos Santos' power is a bit suspect.
After a three-round slobberknocker with Roy Nelson, he just couldn't put him away, which leads me to believe that he might not have the knockout power necessary to put Cain to sleep.
Velasquez, on the other hand, is a powerful and crisp striker who mixes both fists and legs to be very effective.
While Cain exhibited extraordinary wrestling and scrambling abilities during his bout with Lesnar, Dos Santos brings an underrated and underutilized ground game ( he's a BJJ Brown Belt under his fellow Blackhouse teammate Antonio Rodrigo Nogueira).
This may prove to be pretty interesting if the fight should go to the ground.
Overall Fighter Ability
This has to go to Cain. His conditioning, speed, level head and relentless attack will be too much for Dos Santos to deal with, hence giving him the edge in this bout.