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His personal best time was 2:09:01 at the
Amsterdam Marathon of 26 April 1980, which was at the time the second best marathon ever (after
Derek Clayton's 2:08:34 run in 1969).[nb 1]
Notes
^The
International Association of Athletics Federations has published a progression of road racing world bests and records that were widely recognized prior to ratification and official acceptance by the IAAF. According to that progression, Clayton's 2:08:34 performance in Antwerp on May 30, 1969 was a world best at the time.[2] Other road racing authorities, including the
Association of Road Racing Statisticians, consider Clayton's performance to have occurred on a short course and recognize other athletes - including Nijboer - in the progression for world best in the marathon.[3]