So, you wanna be a submission fighter? Chael Sonnen hung up his MMA gloves earlier this year, but his days of issuing challenges are far from over. Sonnen’s submission grappling promotion, Submission Underground, continues to go from strength to strength, with events streamed live on UFC Fight Pass and attracting big names from the worlds of both MMA and grappling. This past weekend at Submission Underground 10, Sonnen engineered a callout of a different kind as he threw down the gauntlet for anyone to step up and challenge two of the planet’s very best submission specialists. His promotion’s next event, Submission Underground 11, will feature a special tag-team matchup, with Australian ace Craig Jones telling Sonnen he hoped to convince his teammate – and arguably the best grappler in the world – Gordon Ryan to team up with him for the event
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