Both have similar record and around the same age. Tom came from a win against Andrei Arlovski however Sergey have fought more experienced fighters totally.
If Toms wrestling are in that level as I can see he should outwrestle Sergey, in stand up I believe Sergey can make a tko win.
If Toms wrestling are in that level as I can see he should outwrestle Sergey, in stand up I believe Sergey can make a tko win.