Manny Pacquiao’s slated September fight with Floyd Mayweather won’t be an exhibition, the Philippine boxing star said on Thursday, days after his fellow hall of famer claimed their match would be purely entertainment. Netflix announced the long-rumored rematch of boxing’s highest-grossing bout last month, with Pacquiao and Mayweather — whose current ages are in their late forties — to meet at the Sphere in Las Vegas on Sept. 19. But Mayweather stunned the boxing world this week by proposing that the rivals, whose