All-American Girls Professional Baseball League rules of play progressively extending the length of the base paths and pitching distance, while decreasing the size of the ball until the final year of play in 1954. For the first five years the circuit used a fastpitch underhand motion, shifted to sidearm in the 1947 season, and overhand pitching began in 1948. All-American Girls Professional Baseball League rules of play The All-American Girls Professional Baseball League was a circuit that began to operate in 1943. Since the only organized ball for women in the United States was softball, the league officials created a hybrid game which included features of both fast-pitch
National Tennis League National Tennis League National Tennis Leagues (NTL) was a tour for professional male tennis players established in 1967 by George MacCall. In 1970 it was sold to the World Championship Tennis (WCT), a competing professional tennis league run by Lamar Hunt. The National Tennis League (NTL) was formed by former U.S. Davis Cup captain George MacCall in 1967, as a governing body to a US Professional tennis tour. It was key in moving tennis from a mostly amateur sport to a professional sport. In 1968 Billie Jean King became the first woman of the Open Era to sign a pro