Worth noting

• Center fielder Denard Span, who is currently on the seven-day concussion list, flew back to Washington on Wednesday morning to visit the team doctor.

If Span passes the tests, he will go on a rehab assignment Thursday. The location depends on the weather forecast. If he feels good following that game, he will be pushed from three up to four at-bats on Friday.

"If he gets through those two games he should be fine," Williams said. "We'd like him back as quickly as possible for sure."

• Utility player Kevin Frandsen felt a spasm in his back on the final at-bat of Tuesday night's 11-2 loss. Frandsen told Williams on Wednesday he was fine.

"He reported with all his work to have no issues," Williams said. "He's not in the starting lineup [Wednesday], but he's available."

• According to Williams, outfielder Scott Hairston continues to progress on schedule. Hairston went on the 15-day disabled list on April 6 with a strained left oblique. He has not swung a bat yet.

"He's progressing into rigorous activity," Williams said. "Those things are tough. You've got to make sure you're really careful because if you have an additional setback it takes a long time."

• Right-hander Doug Fister will pitch two innings in an extended spring training game on Thursday in Viera, Fla.

Fister, who tossed 50 pitches in a bullpen session Monday, left Wednesday. The hope is to get him back on a rotation schedule. Williams expects Fister to periodically fly back to Washington to check on how he feels.

"Plan right now is we'll wait five days," Williams said. "After that he'll do that again in extended increased to three innings depending on workload, and then we'll send him out for a four-inning or five-inning rehab start. He should be good to go if all goes well. That's the tentative plan. It's not written in stone because you don't know how he's going to feel. It may even turn bigger than that depending on how it goes."

Christina De Nicola is a contributor to MLB.com. Teddy Cahill is a reporter for MLB.com. Follow him on Twitter at @tedcahill. This story was not subject to the approval of Major League Baseball or its clubs.