Joe Riggs ’ bid for an M-1 middleweight title concluded with a painful injury. At today’s M-1 Challenge 93 event in Chelyabinsk, Russia, the former UFC, WEC and Strikeforce fighter – who’s competed professionally for the past 17 years – was forced to quit in the second round after his knee buckled during an apparent takedown attempt.
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Ouch: Joe Riggs’ knee painfully collapsed in today’s M-1 Challenge 93 title fight – MMA Junkie