Joe Biggs says he has heard from David Rodriguez, ex-heavyweight boxer, and friend of Mayweather, that Mayweather has signed the fight contract with McGregor. https://twitter.com/Rambobiggs/status/874421839807868928 https://twitter.com/Rambobiggs/status/874422279710572546 https://twitter.com/Rambobiggs/status/874424272923615237