 Delp, along with John J. Tammaro, Jr., King T. Leatherbury and Richard E. Dutrow, Sr. were known as Maryland racing's "Big Four" who dominated racing in that state during the 1960s and 1970s and who helped modernize thoroughbred racing.During his career, Bud Delp's horses won 3,674 races and earned purses totaling nearly $41 million.He ended his career at a 20.5 win percentage.