Before the first race is run Saturday on Opening Night of its 38-day Spring Meet, Churchill Downs Racetrack announced that purses will be raised an additional $3.1 million thanks to revenue from the historical racing machines at Derby City Gaming. Total purses offered in the first condition book for horsemen, which covers 190 races over 19 dates through Thursday, May 27, have grown to $22,822,100 for a daily average of $1,201,163. That represents a 5.9% increase from the previously published $21,544,000. Maiden special weight races are now worth $115,000 during...