Bailey, who's out with a right forearm strain, threw 35 pitches before the A's Tuesday game against the Angels, and manager Bob Geren said both Bailey and pitching coach Ron Romanick were pleased with what they saw.
"He had a side day that went really well," Geren said. "He's going to take it to the next step now and start spinning breaking balls. Being that it's the first time that he's going to actually throw something other than a fastball means we're moving in the right direction."
Geren added that it shouldn't be long until Bailey is ready to face live hitters.