The Cincinnati Reds are an American professional baseball team based in Cincinnati. The Reds compete in Major League Baseball (MLB) as a member club of the National League (NL) Central division, and were a charter member of the American Association in 1881 before joining the NL in 1890.The Reds played in the NL West division from 1969 to 1993, before joining the Central division in 1994. They have won five World Series championships, nine NL pennants, one AA pennant, and ten division titles. The team plays its home games at Great American Ball Park, which opened in 2003. Bob Castellini has been the CEO of the Reds since 2006. From 1882 to 2021, the Reds' overall win–loss record is 10,713–10,501 (a .505 winning percentage).