The new Olympic 800m champion and world record holder David Rudisha has said that his feats this evening were "unbelievable".
The Kenyan led from start to finish and crossed the line in 1:40.91, a whole tenth of a second quicker than the previous best.
Speaking to BBC Sport afterwards, the 23-year-old said: "This is the moment I've been waiting for for a very long time.
"To come here and break the world record is unbelievable."
Rudisha went on to say that he wanted to make London 2012 chief Lord Sebastian Coe "proud" after being shown round the stadium by the former Olympic champion earlier this year.