Career
From 1997-2005, he played for the Seibu Lions in Nippon Professional Baseball. After the 2005 season, he was acquired by the Tampa Bay Devil Rays through the posting system. Originally slated to compete for the Devil Ray"s closer job during the 2006 MLB season, he tore the labrum in his shoulder and missed the entire season.
He was subsequently released by the Devil Rays.
Returning to Japan, in 2009 Mori joined the Ishikawa Million Stars of the semi-pro Baseball Challenge League as a pitcher-coach. Retiring from playing, he took over as the Million Stars manager in 2010, staying through the 2014 season.
He returned to active duty as a player in 2013, and was the Million Stars" player-manager in 2013–2014.