Game status, Bourn, Tillman, Joseph on Aquino (O's up 4-2)

Tonight's game is expected to start at approximately 7:30 p.m. following a brief delay caused by a light rain at Camden Yards.

Outfielder Michael Bourn, who broke the ring finger on his right hand two months ago, will play in his first extended spring training game on Tuesday in Sarasota.

Bourn has been working out after signing a restructured minor league deal with the Orioles.

Chris Tillman has thrown three innings for Double-A Bowie in Harrisburg and allowed three runs and four hits, including a solo home run by Zach Collier in the second. He's walked none and struck out three.

Tillman has thrown 49 pitches and likely will work one more inning.

I wrote earlier today that Zach Britton could start throwing on Monday after being examined by a hand specialist. An MRI on his right elbow and forearm were good and Britton no longer is bothered by any discomfort.

Britton admitted that he was "a little nervous" about the MRI.

"The forearm actually looked pretty good, too," he said. "Just maybe a little inflammation in there. But overall the reports were really good. It's feeling good every day and this will kind of keep us on track.

"Right now, I feel good. I feel like I could play catch, but they want to make sure they talk to those doctors and let them look over the inflammation and see if there's anything we're not doing to strengthen it. That's really all we're worried about. Not treating it, but more what can we do for this not to come back. But I'm feeling pretty good."

Jayson Aquino is waiting to make his first major league start. And to find out whether he stays with the Orioles or is optioned following the game. They're always massaging the 25-man roster, and Thursday's off-day could bring an adjustment to the rotation.

"He basically won the job when Chris went down this spring," said manager Buck Showalter. "We liked the matchup better with (Alec) Asher in Toronto and we might like it potentially ... We've got to find out about both of them. We don't need a fifth starter until May 2, which could be Chris Tillman if you do the math of the starts. I really didn't want to have this day kind of come and go without getting a feel for what we have with Jayson.

"The one thing we like about him is this guy ain't scared. He's got some personality that we didn't see last year. I really like the personality of his pitching, if that makes any sense. He's got a little personality when he's pitching.

"He's going to have to command the fastball and the changeup's going to have to be a pitch for him. If he can't command the fastball, the changeup doesn't work too good. He's got a good hand. See if it works tonight. And what do you do after the game. Keep him, send him out? And if you send him out, who do you bring up?

"I'm not going to go up to him and say, 'Hey, regardless of how you pitch, you're going out.' That doesn't make any sense. I'd like to keep him. I know Alec's pretty excited about not being sent back out. We liked his background as a relief pitcher and we weren't sure if we were going to get through those games where we could pitch Aquino. Fortunately, we got some good starts."

Caleb Joseph will be behind the plate. Maybe he's the personal catcher to the left-handed starters and not just Wade Miley.

Joseph caught Aquino in a spring training game against the Yankees in Tampa and in a few bullpen sessions.

"I know what he brings," Joseph said. "I haven't caught him a lot, but just those three innings and they still had quite a few of their guys in, so kind of learning what he does against the bigger-name players versus the No. 87s. Three innings was enough to understand the idea of how he likes to go about it. And obviously we'll look at their advance reports on lefties and try to combine what he brings and what the scouting reports say and come up with a good game plan.

"Hopefully, it's just about execution. First start in the big leagues, there's probably going to be a little nerves and jitters, so you've got to try your best to be proactive as a catcher. If you see something, maybe slow it down for him and encourage him a little bit more. Stuff like that. I know what he brings. He had a really nice spring and that was against a lot of major leaguers, too, so we're looking forward to his contribution tonight."

Aquino now carries a breaking ball that has increased his stature in the organization.

"A really tight spinning breaking ball," Joseph said. "Really helps him with right-handers. Similar to Miley with the darting action. He can work the ball all over the place and he works pretty fast. As soon as he gets the sign, he gets going. He has a fast-tempo windup and I like that about him."

Update: Tillman threw 58 pitches in 3 2/3 innings and allowed three runs and five hits, walked none and struck out three.

Update II: Orioles pitchers had allowed one run in the last 35 innings before Aquino served up a two-run shot to Jackie Bradley Jr. in the third that gave Boston a 2-0 lead. The ball landed on Eutaw Street, the 89th in the ballpark's history.

Aquino hung a slider and Bradley crushed it, making him 3-for-3 lifetime against the left-hander.

Update III: Trey Mancini hit a two-run homer in the fourth and Jonathan Schoop followed with a home run to give the Orioles a 3-2 lead. Steven Wright is done after 3 2/3 innings.

Mancini and Schoop also went back-to-back against Wright on April 12.

Adam Jones added a two-out RBI single to make it 4-2.