UFC 61: Bitter Rivals was a mixed martial arts event held by the Ultimate Fighting Championship on Saturday, July 8, 2006. The main event was a Heavyweight Championship match between champion Tim Sylvia and former champion Andrei Arlovski. The co-main event was the highly anticipated re-match of TUF 3 coaches Tito Ortiz and Ken Shamrock.

UFC 61: Bitter Rivals

UFC Fight Night 4: Bonnar vs Jardine was a mixed martial arts event held by the Ultimate Fighting Championship on April 6, 2006. The event took place at Hard Rock Hotel and Casino, in Las Vegas, Nevada and was broadcast live on Spike TV in the United States and Canada.