Early career Samuel Wanjirū was born in
Nyahururu,
Laikipia County, a town in the
Rift Valley, about northwest of the capital,
Nairobi. and was brought up with his brother Simon Njoroge in poverty by his mother Hannah Wanjiru, the daughter of Samuel Kamau. Wanjirū took his mother's given name as a surname, because she was a single mother. He dropped out of school aged around 12 because they could not afford the school fees. Wanjirū started running at the age of 8. In 2002, he moved to
Japan and enrolled in Sendai Ikuei Gakuen High School in
Sendai. He had success on the Japanese
cross country circuit, where he won the
Fukuoka International Cross Country at sixteen years old in 2003. He went on to win in both
Fukuoka and at the
Chiba International Cross Country consecutively in 2004 and 2005. After graduating in 2005, he joined the
Toyota Kyūshū athletics team, coached by 1992 Olympic marathon
silver medalist
Koichi Morishita. Wanjirū had a
5000 m best of 13:12.40, run as a 17-year-old in April 2004 in
Hiroshima, Japan. At age 18, Wanjirū broke the half marathon world record on 11 September 2005 in the
Rotterdam Half Marathon with a time of 59:16 minutes, officially beating
Paul Tergat's half-marathon record of 59:17 minutes. This was preceded two weeks earlier by a bettering of the
10,000 m U20 world record by a margin of almost 23 seconds in the IAAF Golden League
Van Damme Memorial Race on 26 August. His WJR time of 26:41.75 was good enough for third place in the race behind
Kenenisa Bekele's world record, set in the same race, of 26:17.53 and
Boniface Kiprop's 26:39.77. It was Kiprop who held the previous world junior mark (27:04.00 minutes), set at the same meeting the previous year. The run saw 6 runners going under 27 minutes
World records and Olympic gold Wanjiru took back the half-marathon world record, which
Haile Gebrselassie broke in early 2006, with 58:53 minutes on 9 February 2007 at the
Ras Al Khaimah Half Marathon and improved it to 58:33 on 17 March 2007 in the
City-Pier-City Loop in
The Hague,
Netherlands. While improving his own record, he recorded an unofficial time of 55:31 for 20 km, which was faster than Haile Gebrselassie's world record but was never ratified due to the timing methods in the race. Wanjiru made his marathon debut at
Fukuoka Marathon on 2 December 2007, winning it impressively with a course record of 2:06:39. He started 2008 by winning the
Zayed International Half Marathon and receiving a prize of US$300,000. In the 2008
London Marathon, he came in second, breaking 2:06 for the first time. In the 2008 Summer Olympics, Wanjiru won the marathon gold medal in an Olympic record time of 2:06:32, smashing the previous record of 2:09:21 set by
Carlos Lopes of Portugal in the 1984 Olympics. He received the
AIMS World Athlete of the Year Award that year in recognition of his performances.
London and Chicago wins At the
Granollers Half Marathon in February 2008, in which Wanjiru won, the Kenyan stated his intent for the future, saying, "in five years' time I feel capable of clocking a sub 2 hours time for the marathon." In April 2009, Wanjiru won the London Marathon in a time of 2:05:10, a new personal record and also a new course record. He was pleased with the achievement and stated that he hoped to break Haile Gebrselassie's world record in the near future. At the Rotterdam Half Marathon, Wanjiru clocked a 1:01:08 on 13 September, which was won by
Sammy Kitwara with a time of 58:58. In October 2009, Wanjiru won the
Chicago Marathon in a time of 2:05:41, setting a new course record for the city and the fastest marathon time ever run in the United States. The wins in London and Chicago helped him reach the top of the
World Marathon Majors rankings for 2009, earning him a jackpot of US$500,000. He signed up to defend his title at the
2010 London Marathon, but he encountered knee trouble at the midway point of the race and decided to drop out to avoid further injury – the first time in six marathons that he had failed to finish. He chose to run at the 2010 Chicago Marathon in October, but a stomach virus before the race had hampered his preparations and he entered the competition with the lesser aim of reaching the top three.
Tsegaye Kebede took the opportunity to forge a lead, but Wanjiru (despite a lack of peak physical form) persevered with the pace and caught up with the Ethiopian. He took the lead in the final 400 m to defend his title in Chicago with a time of 2:06:24. "It was the greatest surprise I have ever seen in my life", remarked his coach, Federico Rosa, on the performance. ==Personal life==