Bellator and RIZIN are advertised as adversaries for their upcoming Dec. 31 event. But are they really? In a move rare among major MMA promotions, the two organizations have agreed to a co-promotion that will feature five head-to-head main card matchups featuring Bellator and RIZIN fighters competing against one another. Champions from both organizations are on the marquee, including a headlining bout between Roberto de Souza and A.J
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Video: Does Rizin vs. Bellator show that MMA needs more cross-promoting? – MMA Junkie