Walker held the world record in the mile run (3:49.4) from August 12, 1975 to July 17, 1979. He also held the world record in the 2000 meter run (4:51.4) from June 30, 1976 through August 4, 1985. He also held the world record in the indoor 1500 meter run (3:37.4).
He still holds the New Zealand national record for the mile run (3:49.08).
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