|World Junior Championships|
|1994 Lisbon||1500 metres|
|World Cross Country Championships|
|1993 Amorebieta||Junior race|
|1994 Budapest||Junior race|
He was a promising junior cross country runner, winning the junior men's race at the IAAF World Cross Country Championships in 1993. The following year proved to be his breakthrough season, as he repeated his cross country success at the 1994 edition, won the 1500 metres at the African Junior Athletics Championships, and took a bronze medal in the same event at the 1994 World Junior Championships in Athletics in Lisbon. He also finished fifth in the 5000 metres race at the 1994 Commonwealth Games.
He began to move up in distance over the next few years and set world junior records in the 3000 metres and 5000 m in 1996. He became a regular on the Dutch running circuit in the late nineties: at the Warandeloop cross country race he took third in 1996, won the 1997 edition, and came second the following year.
He broke the meeting record for the 3000 m at the KBC Night of Athletics in 1998, setting a time of 7:41.17. Following this he beat Marathon world record holder Paul Tergat in the Belgrade Race Through History competition in 1998, winning the competition in 17:02. He ran in the senior short race at the 2000 World Cross Country Championships, finishing in seventh place overall. He made top ten finishes in the Zevenheuvelenloop 15 km race in 2000 and 2001 and won the 2002 Parelloop competition. He set a 10-mile race best in 2001 running in the Dam tot Damloop, where he finished in fifth place with 46:34. He took the silver medal in the 3000 m at the Fanny Blankers-Koen Games in 2002, his time of 7:42.76 not enough to beat compatriot Richard Limo.
He joined the Hitachi running team in Japan and in 2004 he broke a meeting record at the Osaka Grand Prix. His time of 13:10.48 in the 5000 m bettered Haile Gebrselassie's previous mark by over three seconds. At the 2004 Sapporo Half Marathon, Mosima ran a personal best of 1:02:21 for ninth place. That same year, he formed part of the Kenyan team for the International Chiba Ekiden, and they finished second behind the Ethiopian team.
|Track||1500 m||3:35.65||Arnhem, Netherlands||12 July 1997|
|3000 m||7:35.52||London, United Kingdom||12 July 1996|
|Two miles||8:14.45||Hengelo, Netherlands||31 May 1997|
|5000 m||12:53.72||Rome, Italy||5 June 1996|
|Road||15 km||43:48+||Sapporo, Japan||4 July 2004|
|10 miles||46:34||Zaandam, Netherlands||23 September 2001|
|20 km||58:58+||Sapporo, Japan||4 July 2004|
|Half marathon||1:02:21||Sapporo, Japan||4 July 2004|
- All information taken from IAAF profile.
- nb Philip Mosima's surname is sometimes incorrectly stated as Mossima.
- 3000 Metres junior All Time. IAAF (2009-10-14). Retrieved on 2009-10-15.
- 5000 Metres junior All Time. IAAF (2009-10-15). Retrieved on 2009-10-15.
- Warandeloop Cross. Association of Road Running Statisticians (2008-11-28). Retrieved on 2009-10-15.
- Beste 10 gala mannen (in Dutch). Warandeloop. Retrieved on 2009-10-15.
- Meeting records. KBC Night of Athletics. Retrieved on 2009-10-15.
- Sporting Digest: Athletics. The Independent (1998-10-15). Retrieved on 2009-10-15.
- Parelloop 10 km. Association of Road Running Statisticians (2009-03-29). Retrieved on 2009-10-15.
- Top drie mannen en vrouwen Dam tot Damloop aller tijden (in Dutch). Dam tot Damloop. Retrieved on 2009-10-15.
- Leg "cramps" slay Gebrselassie’s record bid . IAAF (2002-06-22). Retrieved on 2009-10-15.
- Nakamura, Ken (2004-09-23). Gatlin and Murofushi win in Yokohama. IAAF. Retrieved on 2009-10-15.
- Nakamura, Ken (2004-07-04). Ndereba and Wainaina fare badly in Sapporo. IAAF. Retrieved on 2009-10-15.
- Nakamura, Ken (2004-11-23). Ethiopia three-peat in Chiba. IAAF. Retrieved on 2009-10-15.