Aouita was on world-record pace early in the race on a hot afternoon.

Tonight, he sprinted the first 50 meters in 24.05 seconds, which put him on world-record pace.

If he goes out at a world-record pace, the other runners said, they will not follow.

O'Brien opened today with a 100-meter sprint of 10.32 seconds, which put him on world-record pace.

In the final, he was on world-record pace for 150 meters.

Still by Mile 15, she was 47 seconds ahead of the pace and less than a minute behind the world-record pace.

At 50 meters, Martino led in 26.74 seconds, a world-record pace.

If he's really stretched close to world-record pace, that could have an effect on him.

Today, a male escort called out her split times, which were on world-record pace the entire race.

Phelps was ahead of his own world-record pace at every wall and won by 6 1/2 meters, a huge margin for this relatively short race.