But after 80m of Wednesday's 200m heat, the fourth of seven rounds of competition, reigning world champion Johnson-Thompson crashed to the floor in agony and remained there with her head in her hands.
A wheelchair was brought to the track but she refused that and decided to carry on running to record a time.
Katarina Johnson-Thompson limps to finish the 200m heats in the women's heptathlon after pulling up with an injury. Photo / Getty
However, in a cruel twist, officials disqualified her after deeming she had stepped outside of her lane.
Wow, just saw Katarina Johnson-Thompson, the world heptathlon champion, refuse a wheelchair in obvious distress so she could limp across the finish line in the 200, the last event of Day 1.
Katarina Johnson-Thompson of Team Great Britain receives medical attention as she sits injured during the women's heptathlon 200m heats. Photo / Getty
"Unfortunately Katarina Johnson-Thompson sustained an injury to her right calf during the 200m and has had to withdraw from the heptathlon," British Athletics said in a statement.
"To confirm, it is not a repeat of her recent Achilles injury which was on her left leg. There will be no further comment this evening."