Floyd Mayweather Jr. has a record 27 world title wins without a loss.
" Mayweather announced his retirement in the ring after defeating Berto, walking away from the sport with an undefeated record of 490
 The fight was entitled "Undefeated"; it took place December 8, 2007, at the MGM Grand Garden Arena, Las Vegas, Nevada, the biggest welterweight showdown between two undefeated fighters since De La Hoya met Flix Trinidad in 1999

