Sylvester Stallone wrote the Rocky script in 20 straight hours

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Stallone gained worldwide fame with his starring role in the smash hit Rocky (1976). On March 24, 1975, Stallone saw the Muhammad AliChuck Wepner fight, which inspired the foundation idea of Rocky. That night Stallone went home, and after three days, 20 straight hours he had written the script. He tried to sell the script with the intention of playing the lead role.Robert Chartoff and Irwin Winkler liked the script.[citation needed] Stallone was offered increasingly larger fees to sell the script and allow a different actor to star in the film, but he turned the offers down until the studio agreed to let Stallone himself play the role.

Rocky was nominated for ten Academy Awards, including Best Actor and Best Original Screenplay nominations for Stallone. The film went on to win the Academy Awards for Best Picture,Best Directing and Best Film Editing.