On June 12, 1965, Shigematsu set a world's best in the marathon with a time of 2:12:00 at the Polytechnic Marathon. Less than two months earlier, he had set a course record at the 1965 Boston Marathon (2:16:33). In his career, in 22 marathons started, he recorded 6 victories, placed second 3 times and third once. Shigematsu ran seven marathons under 2:20.
- All results regarding marathon, unless stated otherwise
|1965||Boston Marathon||Boston, United States||1st||2:16:33|
- On 40th anniversary of first sub-2:09, pioneering Clayton looks back on his Marathon World records . IAAF (2009-05-30). Retrieved on 2015-01-23.
- 1965 article from The Times
- Boston Marathon History. Boston Marathon. Retrieved on 2015-01-23.
| Men's marathon world record holder
June 12, 1965–December 3, 1967
| Men's Polytechnic Marathon winner
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