Olympic 200 silver medallist Felix and training partner Jeneba Tarmoh finished in the same time, 11.068 seconds, and USA Track & Field officials were searching for a solution on who to award the final spot for London in the event.
Only the top three finishers make the US team for the Games, and not even a review of pictures from two cameras at the finish line could determine who would join winner Carmelita Jeter and runner-up Tianna Madison in London.
Tarmoh was originally given the third spot but after a close study of the photo finish officials called it a dead heat.
Picture from the outside camera were inconclusive due to athletes' arms blocking a clear view of their torsos. The torso is usually used to determine finishes and times.
Officials then reviewed the inside camera and called the race a tie.
Whatever solution officials find to settle the dead heat, Felix will have a second chance to make the US team when she runs the 200 at the trials next week.