The 26-year-old was struggling with a hamstring injury before the race but still managed to power home in 62.87 seconds, at least 20 metres ahead of the rest of the field.
“My hamstring has been touch and go,“ Cox said. “I’m absolutely shattered. That was a very painful run but it meant a lot.”
The night of action also witnessed a courageous performance from Australian James Turner in the men’s 400m T36 final.
The 21-year-old, who set two world records at the London Stadium in the heats and final of the 200m, had a good lead over the rest of the field down the final home straight but was stumbling towards the line with fatigue before finishing in an area record of 54.27. The Australian needed medical attention straight after the race.
“I was in a lot of pain, but I have recovered now,” he said later. “In the last 50 metres I had nothing in my legs. On Sunday I have a race but I’m deciding whether to pull out or not because I am quite tired and not sure I can complete an 800m.”
Switzerland’s Marcel Hug was relieved as well as euphoric after he won a re-run of the men’s 800m T54 final in 1:38.40 for his second gold medal. The wheelchair racer had won the original final on Monday but the result was annulled because of a crash.
The London Stadium also witnessed a world record from Morocco’s Mohamed Amguoun who clocked 46.92 to take gold in the men’s 400 T13 final.
“To be honest, I was ready to go even faster,” he said. “I felt a bit of headwind, especially in the curves so it slowed me down. I was hoping to go under 46 seconds.”
Tunisia’s Walid Ktila won the men’s 200m T34 in 27.14 to complete his quartet of golds and repeat his achievement at the Doha 2015 World Championships. His other victories in the 100m, 400m and 800m have steered his country to fifth in the medal table with 10 golds.
Morocco’s Mahdi Afri won the 200m T12 final in 22.39 to clinch his second gold after victory in the 400m.
Oksana Zubkovska was the pick of the day’s field event athletes. The Ukrainian world record-holder won the long jump T12 contest by nearly half a metre with a leap of 6.02m.
With 16 sessions of world-class athletics available over 10 days, there are tickets for just £10 for an adult and £5 for a child across all sessions. Don’t miss out, get your tickets now at https://tickets.london2017athletics.com/.