Wanjiru is multiple Kenyan champion in 20 km walking . She won her first national title in 2000. Internationally, she was particularly successful at the African Athletics Championships . In 2002 in Radès, she won the bronze medal in the 10-kilometer distance. In 2004 in Brazzaville, 2008 in Addis Ababa and 2010 in Nairobi, she was each African champion over 20 kilometers. In the latter victory, she set an African record over this distance with a time of 1:34:19 hours. At the Commonwealth Games in New Delhi in 2010 , she was third.
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