Manteo Mitchell goes all hero-mode, and gets the US 4x400 team through to the finals.
BBC Sport - Olympics relay: Broken leg for Manteo Mitchell of US
American runner Manteo Mitchell has revealed he ran the last 200m of the Olympic men's 4x400m relay heats with a broken left leg. Mitchell began the race for the United States, who went through to Friday's final as the second fastest team despite Mitchell's injury.
"As soon as I took the first step past the 200m mark, I felt it break." Manteo told the USA Track and Field website
"I didn't want to let the three guys or the team down, so I just ran on it."
BBC Sport - Olympics relay: Broken leg for Manteo Mitchell of US