The lottery will remain open until 11:59 p.m. on Friday, February 15th.
It is the first time a lottery system has been used in the history of the race, which last year attracted 40,000 runners.
In a statement on the race website, organizers explained why the first-come, first-served system of previous years is being replaced with a lottery:
"Under the first-come, first-served system the race was filling up faster and faster each year. In 2012, the race closed in five hours. The first-come, first-served basis discriminated against individuals who could not access their computers from work. In addition, due to the volume of traffic, most people experienced system issues which caused people to be uncertain if their entry had been accepted or not."
For more information: visit the website of the Blue Cross Broad Street Run.