The Tohoku Rakuten Golden Eagles have completed 17 seasons in Nippon Professional Baseball (NPB) since their inaugural season in 2005. The team was formed to fill the void left in the Pacific League when the Osaka Kintetsu Buffaloes and the Orix BlueWave merged into one team during the 2004 NPB realignment. Through 2021, they have played 2,402 regular season games, winning 1,081, losing 1,248, and tying 73 for a winning percentage of .464. The Eagles have also a combined record of 15–14–1 (.517) in post-season and Japan Series play. The team that is based in Sendai, Miyagi Prefecture.