Sergei was billed as the guy to beat Fedor until Nogueira took him out in the hw grand prix. He's an awesome fighter on his game. Alexs and Overeem are the two mishaps on his career, besides that he's been impressive.
Kharitonov also has the power of Sambo and being a Russian parachute jumper in the army or something. Been working his standup at Golden Glory as well.