The facility stopped holding live races in June 2008 and, in July 2010, officially closed, unable to simulcast races from other tracks after falling into bankruptcy.
In January, a Pennsylvania-based gaming company purchased the track for $10.2 million. Penn National Gaming officials said they intended to bring back live races and introduce slots to the site.
Rosecroft reopened in August, when it began simulcasting harness and quarter horse races from across the country.
Friday marks the the first of about 20 races planned this season. A grand reopening celebration is planned for the weekend of Oct. 28.