Dodgers ‘treading lightly’ with Edwin Díaz as he works to regain velocity

For a sport that obsesses over mountains of data, and analyzes players on the most minuscule of scales, baseball can still be full of mysterious performance issues and physiological disconnects. The one facing the Dodgers right now: What to make of Edwin Díaz’s decreased fastball velocity early this season? Coming off his blockbuster $69 million…