 Only one year later in 1969, the Mets won their first World Series, beating the Baltimore Orioles, 4 games to 1.The Mets first manager during their first years at the Polo Grounds, former home of the New York Giants was former NY Giants player, Boston Braves and NY Yankees manager, Casey Stengel.After Payson's death, her daughter, Lorinda de Roulet, assumed ownership of the team and delegated a great deal of authority to Grant.