#8. Andrei Arlovski
When Andrei “The Pitbull” Arlovski won the UFC Heavyweight Championship from Tim Sylvia at UFC 51 in February of 2005, he became the second of two Russian Heavyweight Champions who seemed Mike Tyson-esque with their invincible aura.
The other? Fedor Emelianenko.
Arlovski was a brutal knockout artist who put fear into the minds of most of his opponents at the time before ever stepping into the cage with them.
Unfortunately for Arlovski, his reign as an unbeatable champion didn’t last nearly as long as his Russian counterpart, as he would only defend the title twice successfully before dropping it back to Sylvia in April of 2006 and losing a rubber-match against him in July.
Since his lone reign as UFC Heavyweight Champion, Arlovski has had a mixed-bag of wins and losses, however this past June he made his return to the UFC Octagon for the first time since March of 2008, as he defeated Brendan Schaub via split decision at UFC 174.