Once the ball is returned to the pitcher after a hit, no runner may advance.

The fastest six runners in each heat advanced to the final round.

Only four runners advanced from the heat to the final.

The top two runners in each advanced to the final.

Both runners advanced into scoring position, to second and third.

The top five runners from each heat advanced to the final.

Reynolds's time was 44.81 seconds, as all four runners advanced to the final on Saturday.

The top two runners in each heat advanced to the final, which was held on the second day, 7 April.

In either case, the ball is live, and the runners may advance on the play, at their own peril.

The first three runners from each heat advanced to the semifinals.