DNF

It’s a track star’s worst nightmare — the possibility of a DNF.

Derek Redmond was determined. He had to finish the race. Period.

He was a young British runner, one who had sky rocketed to fame by shattering his country’s 400-meter record at age 19. But then an Achilles tendon injury forced him to withdraw from the 1988 Olympic Games in Seoul, and he endured five separate surgeries. When the Summer Olympics arrived in Barcelona in 1992, Derek Redmond was absolutely aching for a medal.

On the day of the 400-meter race, 65,000 fans streamed into the stadium, anxious to witness one of sports’ most thrilling events. High in the stands is Derek’s father, Jim, a faithful witness to every one of his son’s world competitions. According to ESPN, Jim is wearing a T-shirt that reads, “Have you hugged your foot today?”

The race begins and Derek breaks through the pack to seize the lead. “Keep it up, keep it up,” his father Jim says to himself. Heading down the backstretch, only 175 meters from the finish line, Derek is a shoo-in to win this semifinal heat and...