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Boxing Star Mia St. John Calls Out Cyborg For Playboy Mansion Fight!!

Related Topics: Mia St. John, Playboy Mansion, Cyborg

Former boxing champ Mia St. John is technically retired ... but says there's one fighter who could lure her back into the ring -- UFC superstar Cris Cyborg!

One catch, though -- it's gotta happen at the Playboy Mansion.

We got Mia -- a former Playboy cover girl -- the day after Hugh Hefner's passing ... and she showed Hef mad love for exposing her to the world.

But when the convo turned to her career ... MSJ told us she was officially done -- UNLESS she gets offered a match with Cyborg at Hugh's legendary crib.