I believe Sugar Ray Robinson might have beat 65 contenders during his total career, but how many did he beat by the time he was 128-1?
58 wins over 39 different contenders. So 58-1-1 total, with the loss to LaMotta being made up by Robinson winning the series 5-1, and the draw with Jose Basora being avenged via KO1.
Contenders most often also includes Top Noted fighters, as Top 10 Ratings are not always accurate, neutral or without persuasion... Robinson fought at least 75 top & noted fighters and many more over the course of his career.