Stallone gained worldwide fame with his starring role in the smash hit Rocky (1976). On March 24, 1975, Stallone saw the Muhammad Ali–Chuck Wepner fight. That night Stallone went home, and after three days and 20 straight hours, he had written the script, but Stallone subsequently denied that Wepner provided any inspiration for it. Other possible inspirations for the film may have included Rocky Graziano's autobiography Somebody Up There Likes Me, and the movie of the same name. Wepner filed a lawsuit which was eventually settled with Stallone for an undisclosed amount. Stallone attempted to sell the script to multiple studios, with the intention of playing the lead role himself. Irwin Winkler and Robert Chartoff became interested and offered Stallone US$350,000 for the rights, but had their own casting ideas for the lead role, including Robert Redford and Burt Reynolds. Stallone refused to sell unless he played the lead character and eventually, after a substantial budget cut to compromise, it was agreed he could be the star.