Former IBO welterweight champion Chris van Heerden knows firsthand what it's like to BOX Conor McGregor -- and tells TMZ Sports the guy is gonna get ROCKED by Floyd Mayweather on August 26th at the T-Mobile Arena in Las Vegas. The 29-year-old professional fighter stepped in the ring with Conor in May 2016 to spar for a few rounds -- and dominated the UFC star.
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