Kipchoge won his first individual world championship title in 2003 by winning the junior race at the IAAF World Cross Country Championships and setting a world junior record over 5000 m on the track. At the age of eighteen, he became the senior 5000 m world champion at the 2003 World Championships in Athletics with a championships record, then followed with an Olympic bronze for Kenya in 2004 and a bronze at the 2006 IAAF World Indoor Championships. A five-time World Championship 5000 m finalist, Kipchoge took silver medals at the 2007 World Championships, 2008 Summer Olympics and 2010 Commonwealth Games.

He switched to road running in 2012 and made the second-fastest half marathon debut ever, at 59:25. In his marathon debut, he won the 2013 Hamburg Marathon in a course record time. His first victory at a World Marathon Major came at the Chicago Marathon in 2014, and he went on to become series champion for 2016, 2017, 2018 and 2019. He won the London Marathon a record 4 times, and won the Olympic marathon in 2016. His only losses in a marathon were a second-place finish behind Wilson Kipsang Kiprotich at the 2013 Berlin Marathon, where Kipsang broke the world record, and an eighth-place finish at the 2020 London Marathon.[3][4][5]

On 12 October 2019, Kipchoge ran the marathon distance at a special event in Vienna, Austria, achieving a time of 1:59:40.[6] The run did not count as a new marathon record, as standard competition rules for pacing and fluids were not followed and it was not an open event.

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