Long time Ultimate Fighting Championship (UFC) middleweight contender Jorge Rivera announces his retirement from the sport of mixed martial arts (MMA) after his fight at UFC on FX 1 on Jan. 20, 2012.
UFC 133 fight card: Jorge Rivera vs Constantino Philippou match-up much more than meets the eye
UFC 133 fight card: Jorge Rivera vs Alessio Sakara fight official for Aug. 6 in Philadelphia
UFC 133: Jorge Rivera vs Alessio Sakara fight announced for August 6
Alessio Sakara: 'The UFC said 'if you're not 100-percent, don't fight' (Video)