While the Orioles performed pickoff and outfield drills and took batting practice on the replica Camden Yards field this afternoon, Johan Santana quietly threw a bullpen session between two other practice fields, away from the view of his teammates and manager Buck Showalter.

Santana advanced to a full mound and drew praise from assistant athletic trainer Chris Correnti and pitching rehab coordinator Scott McGregor.

"I felt pretty good, and the thing is I'm able to recover day one all the way to day five. That's what we are working on right now," he said.

"Right now, we want to see how I recover, but also working on all my pitches. I'm working on everything. We're not trying to change anything. We're throwing all the pitches. Today, I warmed up and stopped and went back up and warmed up again. And I felt pretty good."

It's been a while since Santana's left shoulder has responded so favorably after a second surgery in April to repair the capsule. He's signed to a minor league deal and will go on the disabled list while continuing to work with Correnti in Sarasota.

Santana, 35, is expected to throw twice more in the bullpen before possibly having hitters track his pitches. After that, he would graduate to throwing batting practice.

"If we feel good and everything is coming along, we're going to start facing hitters and building it up," he said. "After that, it's just a matter of time. We don't know how long or how many times we're going to do that until we start getting into games and hopefully able to compete.