In what year did Willie Williams set the 100 metres world record that was recorded by the International Association of Athletics Federations?
Men's 100 metres world record progression The first record in the 100 metres for men (athletics) was recognised by the International Amateur Athletics Federation, now known as the International Association of Athletics Federations, in 1912. The record now is 9.58 seconds which was run by Usain Bolt.
Half marathon world record progression The world record in the half marathon has been officially recognised since 1 January 2004 by the International Association of Athletics Federations (IAAF), the international governing body for the sport of athletics. A total of five men's world records and six women's world records have been officially ratified since that date. The IAAF officially recognised the fastest times prior to that date as a "world best" from 1 January 2003 onwards. Before that date, the IAAF did not recognise any road running world records, though the concept of a world record was recognised by other organisations, such as the Association of Road Racing Statisticians (ARRS).