Munoz (shoulder) resumed throwing on flat ground Thursday after he received a platelet-rich plasma injection earlier this month, Shannon Drayer of Seattle Sports 710 AM reports.
Munoz was given the shot after experiencing a setback with his right shoulder. He's expected to know within the next couple days whether he can progress to throwing off a mound, which could quickly lead to a rehab assignment. Things are trending in the right direction, but the Mariners will go slowly with their prized reliever.