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In page John Walker (runner):

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The following year, Walker broke the world record for the 2000 metres, running 4:51.4 in Oslo, Norway, on 30 June 1976. He smashed the ten-year-old existing record, held by Michel Jazy of France, by nearly five seconds. Walker regarded this run as the best race of his life.[citation needed] Steve Cram of Great Britain broke the record by one one-hundredth of a second on 4 August 1985, running 4:51.39 at Budapest, Hungary.[2] Indoors, Walker broke the 1500 metre world record in 1979 with a time of 3:37.4.