<P> When Leonard decided to turn professional, Janks Morton introduced him to Mike Trainer, a friend of his who was an attorney . Trainer talked 24 of his friends and clients into underwriting Leonard's career with an investment of $21,000 to be repaid within four years at 8% interest . Trainer then made Leonard the sole stockholder in Sugar Ray Leonard, Inc . Angelo Dundee, Muhammad Ali's trainer, was brought in to be Leonard's trainer and manager . Many of the people being considered wanted absolute control and a cut somewhere near the manager's traditional 33% . Dundee had a different proposition . Although he would prescribe the training procedures, he would leave the day - to - day work to Dave Jacobs and Janks Morton . He would also choose Leonard's opponents . For his services, Dundee would get 15% of Leonard's purse . </P> <P> Leonard made his professional debut on February 5, 1977 before a crowd of 10,270 at the Civic Center in Baltimore . He was paid $40,044 for the fight . His opponent was Luis "The Bull" Vega, whom he defeated by a six - round unanimous decision . After the fight, Leonard paid back his $21,000 loan to the investors . </P> <P> In his fourteenth professional fight, Leonard fought his first world - ranked opponent, Floyd Mayweather, who was ranked seventeenth . The fight took place on September 9, 1978 . Leonard won by a tenth - round knockout . A month later, Leonard defeated his old amateur nemesis Randy Shields by a ten - round unanimous decision . </P> <P> On August 12, 1979, Leonard knocked out Pete Ranzany in four rounds to win the NABF Welterweight Championship . The following month, he made his first title defense against Andy Price . Many felt that Price would give Leonard a tough fight, but Leonard took him out in the first round, advancing his record to 25--0 with 16 knockouts . </P>

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