It's been decided.

Allyson Felix and Jeneba Tarmoh will have a run-off Monday for a chance to compete in the 100 meters at the London Olympics.

The two athletes finished in a dead heat for third place last Saturday in the 100 final and faced several choices to determine who would take the last spot, including a coin flip.

The run-off will be Monday at 5 p.m. local time -- 8 p.m. Eastern -- a day after the U.S. trials are over. Both women have already made the U.S. team.

Tarmoh's time of 11.068 seconds originally gave her a third place victory over Felix by just .001 seconds, but it was later changed to a tie. Carmelita Jeter beat Tianna Madison to win the race.