Like Roberto Duran going up against SRL, 71-1. He would get 30 more wins, but 1 defeat would be thrown in. 71-1 is a lot better than 40-0 IMO.
But maybe Mayweathers undefeated record is all he wants? It doesn't guarantee greatness IMO though. Ali, Sugar Ray Leonard, Duran, Robinson have all tasted defeat, but are great boxers.