Ondiek participated in three events the 1988 Olympic Games. He reached the quarterfinals (second round) in the 100 and the 200 metres races. In the 4x100 metres relay race he was part of the Kenyan team that reached semifinals. Other runners in the team were Peter Wekesa, Simeon Kipkemboi and Elkana Nyang'au.
At the 1992 Summer Olympics he competed in 100 and 200 metres races, reaching quarterfinals in the latter. Year later, at the 1993 World Championships he reached 200 quarter-finals again. He competed at the 1994 Commonwealth Games, but did advance to finals.
- "Former sprinter Ondiek dies in Nairobi". standardmedia. Retrieved 2011-07-15.
- Men 4x100m Relay Olympic Games 1988 Seoul (KOR) - Saturday 01.10
- Commonwealth Games results service
- Men 200m World Championship 1991 Tokyo (JPN) - Tuesday 27.08
- Men 200m World Championship 1993 Stuttgart (GER) - Friday 20.08
- gbrathletics.com: KENYAN CHAMPIONSHIPS
- gbrathletics.com: EAST AND CENTRAL AFRICAN CHAMPIONSHIPS