Floyd Mayweather says his last fight will be in September of 2015Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.SI Staff|Floyd Mayweather says his last fight will be in September of 2015Share on FacebookShare on XAdd us on Copyright 2014 Associated Press. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.Published Jan 19, 2014SI STAFFShare on FacebookShare on XHome/MMA