Keith Thurman talks about the test trainer Dan Birmingham started using when he was 15 years old. Essentially, Birmingham would only accept new talent if they proved they could spar with a teenage Thurman.
Keith "One Time" Thurman is getting ready to take on Robert "The Ghost" Guerrero on March 7 at the MGM Grand Garden Arena in Las Vegas in the co-main event of Premier Boxing Champions' debut card. Watch the broadcast live on NBC at 8:30 p.m. ET, and stay up-to-the-minute with fight alerts.