Boxberger (back) is aiming to throw off a mound Tuesday for the first time since straining a flexor muscle in spring training, Roger Mooney of the Tampa Bay Times reports.
The right-hander is hoping to return sometime in mid-June, so this is an productive step in the right direction. Expect Boxberger to face live hitters as the next step in his recovery program before moving on to pitch in a couple minor league rehab games.