Walker threw 3.2 scoreless innings in Thursday's Grapefruit League game against the Nationals, Anthony DiComo of MLB.com reports.
After throwing two scoreless frames in his spring training debut, Walker turned in another good performance Thursday. Most importantly, he built up to 54 pitches, 35 of which went for strikes. That should put Walker in good position to make the Opening Day roster and start the campaign in the rotation, though he may not throw more than five innings in his first regular-season outing.