Manager Bob Geren said that Jackson's hamstring has been bothering him for the last several days, so he held him out of Thursday's starting lineup.
"He's day-to-day, [it's] something he's been dealing with for a while, a week or so," Geren said.
Crisp's situation also is a day-to-day one. Geren said that Crisp's legs are "a little spent," and that he needs a day off.
Geren said it's not the result of last night's big crash into the wall at Oriole Park at Camden Yards, but from a bunch of things. The manager expects Crisp back for Friday's series opener in Cleveland