McGregor's biggest rival: "No way" Conor beats Mayweather
In this Dec. 12, 2015, file photo, Conor McGregor, left, fights Jose Aldo during a featherweight championship mixed martial arts bout at UFC 194 in Las Vegas. Aldo believes McGregor has no chance to accomplish a stunning upset of Floyd Mayweather when the fighters meet in a boxing match Aug. 26, 2017, in Las Vegas.