Jose Aldo—26 years old
Aldo continues his title run dominance in 2011 and 2012, defeating Mark Hominick at UFC 129 in Toronto; the UFC's biggest show to date. He gets another decision win over Kenny Florian late in the year to secure his place as one of the best pound for pound fighters in the world.
Aldo fights once in 2012 and knocks out Chad Mendes with a devastating knee in the final second of the first round. He was scheduled to defend against Erik Koch in July but had to withdraw due to injury and has not fought since.
He has not lost a fight in over seven years.
Frankie Edgar—31 years old
Edgar enters the year off his stunning knockout victory in his rematch with Gray Maynard and he is still the lightweight king. He loses the title in February to Benson Henderson at UFC 144 in Japan— another controversial decision. Controversy seems to be at play in any Edgar decision, prompting Dana White to grant him an immediate rematch and hint that a change in weight class could be the only solution for him.
Edgar faces Henderson again in August at UFC 150, and despite a better performance that seems to best the current champion, he loses to Henderson via split decision.
Two weeks later, Edgar announces he will move down to featherweight and the Aldo-Edgar hype begins.