Just trying to learn more about Kessler's next opponent and I came across some curious links to my own gym!
Sartison is listed in many sources as a Light Heavyweight.

Two fighters I have trained with Michael Sweeney and John Timlin have fought one "Roland Horvath" with Timlin beating him on points and Sweeney stopping him on points, see my article on Bernard Dunne vs. Machado for more details on that.) Sartison stopped Horvath in two rounds some time ago.

However, my point is. Horvath, although a journeyman, campaigns at Cruiser and Heavyweight! Although he has been stopped (10 times I believe) most were against Cruisers or above.

So that suggests that this Sartison can crack as he took him out in 4!