Hamels will throw a bullpen session Sunday for the first time since injuring his oblique May 2, Jeff Wilson of the Fort Worth Star-Telegram reports.
Hamels resumed throwing in late May, and he is now ready to advance to the next step in his recovery. He could require more bullpen work and will almost certainly head out on a rehab assignment before rejoining the big club, but the Rangers should provide an official update on his status after observing him Sunday and Monday.