Porter won't fight Errol Spence unless Mayweather puts money on table, says Kenny P

By Dan Ambrose: If Floyd Mayweather Jr. wants to get former IBF welterweight champion Shawn Porter (26-1-1, 16 KOs) to fight unbeaten #8 WBA 147lb contender Errol Spence (17-0, 14 KOs) on his next undercard