The Arizona Diamondbacks (often referred to as the D-backs) are an American professional baseball team based in Phoenix, Arizona. The Diamondbacks compete in Major League Baseball (MLB) as a member club of the National League (NL) West Division. The franchise was established on March 9, 1995 and began play in 1998 as an expansion team. The team plays its home games at Chase Field. Along with the Tampa Bay Rays, the Diamondbacks are one of the newest teams in the MLB and are the youngest team to win a World Series, doing so in only their fourth season of existence in 2001.
After a fifth-place finish in their inaugural season, the Diamondbacks made several off-season acquisitions, including future Hall of Fame pitcher Randy Johnson, who won four consecutive Cy Young Awards in his first four seasons with the team. In 1999, Arizona won 100 games and their first division championship. In 2001, they won the World Series over the three-time defending champion New York Yankees, becoming the fastest expansion team in MLB history to win the World Series and the first and only men's major professional sports team in Arizona to win a championship. 22 years later they won their second NLCS and returned to the World Series, losing to the Texas Rangers.