Almost 13 million UK viewers tuned in to watch Paula Radcliffe attempt to run the Olympic 10,000 metres on Friday.
The race got the highest Olympic UK TV audience so far
Radcliffe dropped out of the race with 12 of the 25 laps to go, just five days after quitting the marathon in tears.
An average of 12.8 million people, or 57% of all viewers at the time, watched from 2000-2015 BST, when she pulled up, according to unofficial figures.
Radcliffe was one of Britain's best medal hopes going into the games, which have got strong TV ratings for the BBC.
Her 10,000 metres TV audience was the largest for any Olympic broadcast in the UK so far.
A peak of 10.7 million tuned in for the end of the women's marathon on Sunday - from which Radcliffe retired after 22 miles - while a peak of 9.5 million saw the opening ceremony on 13 August.