Right-hander Jason Hammel, who left Tuesday’s game with a right-knee injury, couldn’t get an MRI on the knee Wednesday because of scheduling. He is slated to have one performed Thursday at 10 a.m.

Hammel, making just his second start since missing nearly eight weeks after arthroscopic surgery in the same knee, said the pain he felt Tuesday was similar to what he felt in mid-July.

“It's sore obviously,” Hammel said. “But until I get a look at the MRI, I don't know what's going on. We'll have more information. I'm frustrated. That's all I can really be right now until something positive shows up. It's just frustrating.”

Hammel was examined by team orthopedist John Wilckens on Wednesday.

“I think the medical term is unremarkable,” manager Buck Showalter said. “But that’s just the early blush, so I don’t think we will really know anything until we get the MRI back tomorrow.”

Hammel said there’s still little swelling in the joint, which is unlike his previous injury.

“But that raises more questions for me, like, what's going on?” Hammel said.

Rotation note: Left-hander Wei-Yin Chen is slated to start Thursday’s series finale, and Joe Saunders is scheduled to pitch Friday in Oakland. The Orioles’ decision on right-hander Chris Tillman, who left his last start with an inflamed ulnar nerve, will dictate the rest of the rotation. Tillman says he feels good enough to pitch. The Orioles could start Tillman or left-hander Zach Britton on Saturday.