The southpaw exited his start last Wednesday against the Tigers after just three innings and immediately underwent an MRI that revealed no structural damage, at which point the A's decided he only needed to miss one turn.
Monday's off-day allowed the A's to keep everyone else on normal rest without recalling a spot starter in place of Kazmir. With Kendall Graveman, Sonny Gray and Jesse Hahn starting the three games in Detroit, the A's could have pitched Jesse Chavez in Boston on Friday and pushed Kazmir to Saturday.
But this schedule allows Kazmir to miss the Angels next week, against whom he is 2-5 with a 7.56 ERA in seven career starts.
Jane Lee is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.