10 July 1993
Kenyan runner Yobes Ondieki surprised the world when he became the first man to run 10 000 Meters in less than 27 minutes. Ondieki was taking part in the Bislett Games in Oslo, Norway, when he made history. This achievement saw him ranked number one in the world in the 10 000 meters.  Prior to the record in Oslo, Ondieki participated in the Olympic Games in 1988 and 1992 but failed to win medals. In 1991 he won the World Championships gold medal in Tokyo and set a Kenyan 5000 meter record of 13; 01.82 in Zurich.
References

Britannica Yobes Ondieki [online] Available at: www.britannica.com [Accessed on 25 June 2012]|Confederation of African Athletics Yobes Ondieki, Kenya [online] Available at: https://www.webcaa.org [Accessed on 25 June 2012]