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 This material may not be published, broadcast, rewritten, or redistributed.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceFloyd Mayweather says his last fight will be in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 This material may not be published, broadcast, rewritten, or redistributed.Add us as a preferred source on GoogleFollowLoading recommendations... Please wait while we load personalized content recommendationsPublished Jan 19, 2014 | Modified Jan 19, 2014SI STAFFShare on FacebookShare on XHome/MMA