|Who is it?||Actor, Stunts|
|Created by||Craig Piligian, Frank Fertitta III, Lorenzo Fertitta, Dana White|
|Starring||Dana White, Tito Ortiz, and Ken Shamrock|
|Country of origin||United States|
|Running time||60 minutes|
|Original network||Spike TV|
|Original release||April 6 – June 24, 2006|
|Preceded by||The Ultimate Fighter 2|
|Followed by||The Ultimate Fighter 4|
|Promotion||Ultimate Fighting Championship|
|Date||June 24, 2006|
|Venue||Hard Rock Hotel and Casino|
|City||Las Vegas, Nevada|
UFC 61: Bitter Rivals was held on July 8, 2006 in Las Vegas, Nevada.
There were several rule changes from the previous Ultimate Fighter seasons. There were to be no team challenges. All fighters would have to win a preliminary match before advancing to the semi-finals—which in practice started the single-elimination tournament at the beginning of the series instead of near the end. The first preliminary match was set by the team who won a coin toss. All subsequent first-round match-ups were set by the team that won the previous match. Each fight was set for two rounds instead of the normal three. If there was a draw after two rounds, the match would go to a final, five-minute tiebreaker round. In such a case, the judges' final decision on the match would be based solely on the third round (unless the fight was stopped by the Referee before the end of the round). Coaches were allowed to bring two other assistant coaches to assist with training, whereas in previous seasons, assistant trainers hired by the UFC worked for both camps!