The great grandmother behind Wayde van Niekerk's world record

South African runner Wayde van Niekerk may have stolen the spotlight from Usain Bolt on Sunday night in Rio.

The 24-year-old shattered Michael Johnson's 17-year-old record in the men's 400 meter run by .15 seconds with a 43.03 run, all from the outside lane.

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When van Niekerk won, Johnson, announcing the Olympics for the BBC, said in awe, "Oh my god."

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What's more, he did so under the guidance of his coach, 74-year-old Anna Botha, who met van Niekerk in 2012 when he began classes at the University of the Free State where she was a track coach.

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Botha and van Niekerk have been working together for almost four years and under her tutelage, van Niekerk has become a world champion and now, an Olympic champion.

Van Niekerk's win is even sweeter given his mother's history as a talented athlete who was prevented from competing internationally in her prime because of South Africa's apartheid laws.

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Later on Sunday night, van Niekerk got a quick visit from another champion: Usain Bolt, fresh from his own gold medal win in the men's 100 meter final.

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