"I had another MRI that came back completely clean," Hahn said, "so I'll rest until I start another throwing program and be ready for spring."
Hahn, a key offseason acquisition and a member of Oakland's Opening Day rotation, posted a 6-6 record and a 3.35 ERA in 16 starts for the green and gold, showing great promise among a crop of youthful arms that will make up what's expected to be an enviable A's rotation for years to come.