Willem Frederik Andries de Beer (born 14 March 1988) is a South African sprinter who specializes in the 400 metres. He won a silver medal in the 4 × 400 m relay at the

2011 World Championships in Athletics The 13th IAAF World Championships in Athletics () was an international athletics competition that was held in Daegu, South Korea. It started on 27 August 2011 and finished on 4 September 2011. The United States topped the medal standings in th ...

in Daegu. At the 2012 Summer Olympics, de Beer was part of the South African team in the 4 x 400 metres relay semifinal, where he was to run the final leg. In the second leg

Ofentse Mogawane Ofentse Mogawane (born 20 February 1982) is a former South African sprinter who specialized in the 400 meters. Career He finished sixth in the 2006 African Championships. He also competed at the 2005 World Championships and the 2006 Commonweal ...

collided with Kenya's

Vincent Mumo Kiilu Vincent Mumo Kiilu (born 3 August 1982) is a Kenyan sprint runner and hurdler who has competed in the 2008 and the 2012 Olympic Games. He has twice competed at the Commonwealth Games (2006 and 2010), including a relay silver medal on his seco ...

, resulting in South Africa's withdrawal from the race. South Africa was passed into the final on appeal to the IAAF, due to interference from the Kenyan athlete who downed Mogawane. They were assigned the 9th lane.Newsday
"Oscar Pistorius, South Africa to run in 4x400-meter Olympic final on appeal"
Associated Press, 9 August 2012 He ran the second leg in the final in which South Africa finished eighth.

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* {{DEFAULTSORT:de Beer, Willem 1988 births Living people Sportspeople from Pretoria South African male sprinters Athletes (track and field) at the 2012 Summer Olympics Olympic athletes of South Africa World Athletics Championships medalists Universiade medalists in athletics (track and field) Universiade bronze medalists for South Africa Medalists at the 2011 Summer Universiade