On April 20 , 1903 On Opening Day, before 8,376 fans at Huntington Avenue Baseball Grounds, the Boston Americans defeat the Philadelphia Athletics in the morning game of a Patriots’ Day twin bill, 9 – 4. Connie Mack’s Athletics win the matinee match-up featuring two future Hall of Fame pitchers, 10 – 7, as 27,658 spectators enjoy watching starters Eddie Plank and Cy Young oppose one another.