Former WWE Superstar CM Punk seemingly indicated on Twitter earlier today this his second ever UFC fight will take place June 9th in Chicago at UFC 225.
https://twitter.com/Luchaman0miedo/status/973286710523191301?ref_src=twsrc%5Etfw
As of this writing there is no word on Punk opponent yet but it was rumored a few weeks back that Punk may be facing Mike Jackson on the card.
