Tobin starts off the show announcing the next March For Cancer. You can register for the May 18th event at marchforcancer.org Tobin recaps UFC Philadelphia. Justin Gaethje knocks out Edson Barboza in a wild slugfest. He wants to move up the rankings but it's pretty muddy ahead of him in the 155lbs division. Josh Emmett knocks out Michael Johnson in vicious fashion. Michelle Waterson puts herself in line for a title shot after defeating Karolina Kowalkiewicz. Conor McGregor announces his retirement from the UFC. Will the promotion give in to his demands as a co-owner of the company? He is spending his retirement down here in Miami. What to make of the sexual assault investigation news leaking the week that he announces he is retiring. Possible leak from the UFC's side or Conor knew this was coming? UFC 239 is shaping up to be an awesome card. Jon Jones vs Thiago Santos, Amanda Nunes vs Holly Holm, Francis Ngannou vs Junior Dos Santos but Jorge Masvidal vs Ben Askren will bring the most buzz on the entire card. Plus Mighty Mouse wins his ONE Championship debut while Eddie Alvarez gets knocked out.