Good ol Jim Ross switched over to boxing?

I was watching a fight the other night and I was like... that announcer sounds familiar. When did JR jump over to boxing? I thought he was a pro rasslin and football guy.
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Source: http://ninjashoes.net/forum/showthread.php?83014-Good-ol-Jim-Ross-switched-over-to-boxing&goto=newpost

Tony Fryklund Kazuyuki Fujita