Tigers reliever Joe Nathan left his rehab appearance early at Triple-A Toledo on Wednesday with what appeared to be an aggravation of his right flexor injury.
Nathan was scheduled to throw one inning and up to 25 pitches in the Mud Hens' Wednesday morning game against Louisville. He had thrown 10 pitches (seven for strikes) with a groundout and a strikeout when his first-pitch offspeed delivery to Louisville's Bryson Smith left him in pain.
Nathan appeared to point towards his elbow or forearm as he talked with head athletic trainer Chris McDonald and pitching coach Mike Maroth near the mound.