Exclusivity is a tough ask for promoters who want to sign and build a fighter but may not necessarily have the resources to give them a living. And from a standpoint of prestige, convincing a prospect to stay in one place when the UFC is calling is nearly impossible. That’s why most regional MMA promotions write into their contracts an out clause that allows a fighter to void his or her deal if the industry-leader comes calling. But there are exceptions to the rule, most notably the shows that hope to compete with the UFC on the national stage
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WSOF President Ray Sefo says UFC outs not built into promotion’s contracts – MMA Junkie