A's announce 2017 Minor League staff

Ryan Christenson's appointment to Triple-A Nashville manager highlights the changes. (Midland RockHounds)OAKLAND -- The A's announced their 2017 Minor League coaching staff on Tuesday, revealing several changes -- chief among them the appointment of Ryan Christenson as manager of Triple-A Nashville.

Christenson, a former A's outfielder, joined the organization as a Minor League manager in 2013 and has led his clubs to postseason appearances in each of his four seasons at the helm, including twice at Double-A Midland, where he guided the RockHounds to back-to-back Texas League titles. He takes over for Steve Scarsone, who moves into the new position of traveling instructor after taking…