Rashad Evans, 5-0. Evans won the heavyweight division on season 2 of "The Ultimate Fighter" before dropping to compete at his more natural light-heavyweight size. Although Evans' five-fight win streak would end when he fought Tito Ortiz to a draw at UFC 73, he would go on to win the light-heavyweight belt just three fights later with a TKO of Forrest Griffin at UFC 92.

Chris Leben, 5-0. "The Crippler" followed up his stint as one of the more colorful fighters on season 1 of "The Ultimate Fighter" with a five-fight unbeaten streak to start his UFC career. Leben's most notable win came by way of split decision over heavy-handed Canadian Patrick Cote, but his reputation for being impossible to stop in the cage came to an end when Anderson Silva smashed him into unconsciousness less than a minute into their bout at Ultimate Fight Night 5.

Mike Swick, 5-0. Another competitor on season 1 of "The Ultimate Fighter", Swick competed on the show as a light-heavyweight before eventually dropping to middleweight and then welterweight in the UFC. Swick's early wins including victories over Joe Riggs and David Loiseau, and began with a 20-second knockout of Alex Schoenauer which earned him the nickname "Quick". Yushin Okami stopped Swick's streak at UFC 69, a loss that convinced Swick to drop to welterweight.

Demian Maia, 5-0. Brazilian Jiu-Jitsu ace Maia began his UFC career with five straight submission victories, winning submission of the night honors an amazing four times during that stretch.  His first-round triangle choke of Chael Sonnen at UFC 95 was widely regarded as one of the best submissions of 2009, but Maia's run came to an end when he was knocked out early in the first round against Nate Marquardt at UFC 102. Maia came back with a victory over Dan Miller at UFC 109, and will have a chance to snap Anderson Silva's record UFC winning streak when the two square off for the UFC middleweight title at UFC 112.

George Sotiropoulos, 5-0. Sotiropoulos became the newest member of the "5-0 Club" with an impressive win over Joe Stevenson at UFC 110. The Aussie started his UFC career after competing as a welterweight on season 6 of "The Ultimate Fighter", but dropped to lightweight after winning his first two matches after the show, and being sidelined for a time with an injury. Sotiropoulos has already made a big impact as a lightweight, racking up three straight wins in the division and prompting UFC president Dana White to say that he could be in the mix for a title shot sometime within the year.