Muhammad Ali: Five key fights

<h3>Muhammad Ali v Sonny Liston: February 25, 1964</h3>Ali was 22 and still known as Cassius Clay when he took on heavyweight world champion Sonny Liston for the first time on February 25, 1964 in Miami Beach, Florida.The brash, fast-talking challenger taunted Liston unceasingly in the build-up to the bout, but few expected him to win.Clay came out strong, using speed and footwork to his advantage against the slower Liston. After the sixth round, Liston, who was suffering from cuts and bruises under his eyes and an apparent injured shoulder, announced he couldn't continue. Clay won the match by technical knockout and then proclaimed to the world: "I am the greatest!" Photo: Getty Images
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Boxing icon Muhammad Ali passed away on Friday. "After a 32-year battle with Parkinson's disease, Muhammad Ali has passed away at the age of 74," spokesman Bob Gunnell said.

Here are the five fights that defined the career of boxing legend Muhammad Ali.