Botswana star Isaac Makwala qualified for the 200m semi-finals at the IAAF World Championships on Wednesday in a dramatic comeback to the competition.
Makwala was reinstated by the IAAF just a few hours before the race, having recovered from an illness that has been described as the norovirus.
Having been withdrawn from the 400m final on Tuesday night, Makwala made his way to the London Stadium to prove that he was fit enough to run, but he was denied entry by security officials.
But after being given the all-clear by the IAAF on Wednesday, Makwala was allowed to run a solo time-trial in the 200m at 7.40pm South African time in order to qualify for the semi-finals.
He needed to run a time of 20.53 or quicker to advance, and he duly obliged, clocking 20.20 seconds.
Makwala is seen as the big threat to South African superstar Wayde van Niekerk's bid for a 200m-400m double, as the Botswana athlete has the fastest time in the world this year of 19.77.
The 30-year-old will now run in the first 200m semi-final at 9.55pm, in the same race as another South African in Akani Simbine.
Van Niekerk will take part in the third semi-final at 10.13pm.