5 retired UFC fighters that should be inducted into the Hall of Fame

#4. Former UFC light heavyweight champion Frank Shamrock

Arguably the UFC's biggest Hall of Fame omission is former UFC light heavyweight and Strikeforce middleweight champion Frank Shamrock. The adopted brother of UFC Hall of Famer Ken Shamrock learned from the Lion's Den and created his own legacy. Shamrock had big shoes to fill after his brother Ken left the sport for a more lucrative WWE career.

Not only did Shamrock step out of his brother's shadow, but he also represented the modern era MMA. As the sport evolved, gone were the days of fighters sticking only to one style. The sport had evolved to where if somebody wanted to be the best, they needed to be well-rounded in all areas. Shamrock excelled at that and was a well-rounded fighter compared to those that came before him.

Shamrock's accomplishments in the sport were impeccable. During his 15-year career, Shamrock won the interim King of Pancrase title while competing in the Japanese-based promotion Pancrase.

Shamrock would eventually join the UFC, where he became their inaugural light heavyweight champion at UFC Japan. All of Shamrock’s UFC bouts were title fights and he remained undefeated during his tenure at 5-0. Shamrock had four successful title defenses, including his 1999 Fight of the Year win over Tito Ortiz.

Shamrock later won the WEC light heavyweight championship and Strikeforce middleweight championship before retiring in 2009.

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#3. Former UFC light heavyweight champion Quinton 'Rampage' Jackson

Another fighter that deserves to be inducted into the UFC Hall of Fame is former UFC light heavyweight champion Quinton 'Rampage' Jackson. Just looking over his accomplishments in MMA as well as the fighters he's defeated, it shouldn't be up for debate.

Throughout his career, Jackson was a feared striker with devastating power that any moment could put his opponent on a highlight-reel. 'Rampage' became a household name fighting in Pride against some of the best fighters in the sport. Jackson defeated top fighters including Chuck Liddell and Kevin Randleman. Jackson's most memorable win was against Ricardo Arona, which ended with Arona being knocked out following a slam.

'Rampage' joined the UFC in 2007 and once again defeated Liddell, this time for the UFC light heavyweight championship. At UFC 75, Jackson made history by defeating Dan Henderson to unify both the light heavyweight and Pride middleweight championships.

Jackson proved that he was also a maketable fighter for the UFC, which is proven with the pay-per-view buyrates on his main events. Jackson's much anticipated bout with former UFC light heavyweight champion Rashad Evans at UFC 114 generated 1,050,000 pay-per-view buys. That number was significant because it was tied for second most pay-per-view buys at the time.