by Rob Woollard Agence-France-Presse LOS ANGELES, United States (AFP) – Floyd Mayweather has vowed to quit boxing once and for all after he emerges from retirement for next month’s cross-combat showdown with Conor McGregor. The 40-year-old former welterweight king, who retired with a perfect 49-0 record in 2015, said Tuesday there was no chance of him fighting again after he climbs into the ring with mixed martial arts star McGregor. The two men are to […]