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Natalya Sologub of Belarus became the first female 400 m runner to be disqualified from the championships, having originally been a 2001 semi-finalist. The 2003 sixth-place finish of Calvin Harrison was annulled for doping, as weer the semi-finalist runs of Amaka Ogoegbunam in 2009 and Antonina Yefremova in 2011.
In the semi-finals, Antonio Watson ran his personal best of 44.13 to lead the field and pulling veteran Vernon Norwood to his personal best of 44.26 in the first semi. This relegated World Record holder, making a heroic return from what should have been a career-ending injury, Wayde van Niekerk to have to wait in the holding room to await his fate.
The semi-final took every athlete who broke 45 seconds into the final. By contrast, in 2015, sixteen athletes broke 45 in the semi-final round. 2015 was the second World Championships for two of the finalists, both former champions, Kirani James and world record holder Wayde van Niekerk. After what should have been a career-ending knee injury ...
The first world record to be set at the World Championships was by Jarmila Kratochvílová of Czechoslovakia, who ran 47.99 seconds to win the 1983 women's 400 m final. A peak of five world records came at the 1993 Championships .
The first world record in the 400 m for men was recognized by the International Amateur Athletics Federation, now known as World Athletics, in 1912.The IAAF ratified Charles Reidpath's 48.2 s performance set at that year's Stockholm Olympics as a world record, but it also recognized the superior mark over 440 yards (402.336 metres) run by Maxie Long in 1900 as a world record.
Except in road events (road running and race walking), the performance must be set in a single-sex race, [2] with the sole exception of the mixed-sex 4 × 400 m relay, introduced by World Athletics in 2017. [3] All team members in a relay race must be of the same nationality.
The 4 × 400 metres relay at the World Championships in Athletics has been contested by both men and women since the inaugural edition in 1983. The competition features three formats in relation to gender: men, women, and mixed. The 2019 edition added in the mixed competition. The format utilizes one set of heats qualifying the top 8 into a final.
While his time from the trials would have made the final, Pistorius ran 46.19 in his semi and did not advance. Kirani James won the final beating LaShawn Merritt on the line with a time of 44.60. [1] [2] At 18 years, 363 days old, James became the youngest ever world medallist for the men's 400 m. [3]