When the 144th Preakness Stakes starts a few minutes before 7:00pm Eastern time on Saturday, it will feature one of the most open fields in decades. Why? Because none of the top four finishers from the Kentucky Derby will be taking part, a circumstance that has not happened since 1951. Country House, the shocking winner at Churchill Downs, is out with a virus, and Maximum Security, the initial winner who was ultimately disqualified, is waiting for the Belmont Stakes.