On January 15, 1999 she finished second at a half marathon race in Tokyo. The race was won by Elana Meyer, who set a world record, while Wanjiru scored did also beat the previous world record by timing 1:06:49 
|1998||Commonwealth Games||Kuala Lumpur, Malaysia||1st||10,000 metres|
|1999||World Championships||Seville, Spain||11th||Marathon||2:29:36|
|2000||Osaka Ladies Marathon||Osaka, Japan||3rd||Marathon||2:23:31|
|Olympic Games||Sydney, Australia||4th||Marathon||2:26:17|
She also competed in the marathon at the 2002 Commonwealth Games in Manchester. She pulled out of the race whilst leading.
- Wanjiru made a cameo in the 2000 Japanese movie "Pinch Runner" as herself.
- Daily Nation, August 39, 1999: Wanjiru fails to come through
- IAAF: Half Marathon All Time
- "1991-2008 Sendai Half Marathon Past Top 20 Finishers". Archived from the original on 2011-07-16. Retrieved 2009-01-20.
- "Maratona feminina de Osaka 2000, Corrida de rua". www.copacabanarunners.net. Retrieved 2018-05-02.
- August 3, 2002: Daily Nation, Lukewarm performance by team in Manchester
- Esther Wanjiru at World Athletics
- Evans, Hilary; Gjerde, Arild; Heijmans, Jeroen; Mallon, Bill. "Esther Wanjiru". Olympics at Sports-Reference.com. Sports Reference LLC. Archived from the original on 2012-11-03.