Since neither guy is in the UFC this belongs in the Strikeforce section.
But honestly Fedor would mop the floor with Sergei. Kharitonov has long been overrated. The fight would be like Monson/Sergei except replace the choke with an armbar.
"If you get hit and it hurts hit him back you not knocked out yet."-Joe Doerksen
The Toxic Terrors (FFL)
Georges St. Pierre*Sarra McMann*Pat Curran*Patricio Freire*Uriah Hall
NP FFL Team Toxic Challenge
Fabricio Werdum*Gilbert Melendez*Rick Hawn*John Dodson*Urijah Faber