Hudson is making his season debut after recovering from surgery in November to repair a herniated disc in his back. The right-hander had discomfort in his back the past two seasons, and the surgery was scheduled after the pain became worse during his offseason workouts.
Hudson was 16-10 with a 3.22 ERA last season. He allowed one run and six hits in 5 2-3 innings in his final rehab start with Gwinnett.
Gearrin was recalled on Tuesday when struggling right-hander Jair Jurrjens was sent to Gwinnett. Gearrin did not appear in a game with Atlanta.
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