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Aldo, the final WEC featherweight champion, was named the UFC's first 145lb champ at a special ceremony at UFC 123 last November. He was initially expected to make his first title defense against Josh Grispi at UFC 125. Aldo suffered a neck injury and had to pull out of that fight.
Grispi lost badly to unheralded UFC debutante Dustin Poirier on the undercard of UFC 125.
Aldo finally defended his UFC title in a five round decision win over Mark Hominick at UFC 129. Aldo took a unanimous decision from the game Canadian, but Hominick ended the fight on a high note by taking Aldo down and ground and pounding the champ for much of the fifth round.
The cancellation of Aldo vs Mendes at UFC 133 is another in a long string of cancelled headliners including the lightweight championship fight between Frankie Edgar and Gray Maynard that was supposed to headline this weekend's UFC 130.
UFC 133 Fight Card so far, August 6 in Philadelphia, Pennsylvania.
Jose Aldo vs Chad Mendes
Phil Davis vs Rashad Evans
Yoshihiro Akiyama vs Vitor Belfort
Rich Franklin vs Antonio Rogerio Nogueira
Jorge Rivera vs Alessio Sakara
Michael McDonald vs Nick Pace
Riki Fukuda vs Rafael Natal
Brian Ebersole vs Dennis Hallman
Johny Hendricks vs Mike Pierce
Phil Davis vs Rashad Evans
Yoshihiro Akiyama vs Vitor Belfort
Rich Franklin vs Antonio Rogerio Nogueira
Jorge Rivera vs Alessio Sakara
Michael McDonald vs Nick Pace
Riki Fukuda vs Rafael Natal
Brian Ebersole vs Dennis Hallman
Johny Hendricks vs Mike Pierce
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