When Stephen Drew opened the season on the disabled list, Red Sox manager John Farrell resolved that the veteran shortstop wouldn’t lose his job because of an injury, regardless of how many hits were piled up by upstart fill-in Jose Iglesias. Farrell has not yet made the same commitment to closer Joel Hanrahan. Hanrahan threw 30 pitches (mostly fastballs) in the bullpen at Fenway Park yesterday, the first time he has pitched off a mound since he was sidelined April 16, and didn’t report any pain in his strained right hamstring. He is scheduled for another bullpen session tomorrow, then perhaps a minor league rehab assignment over the weekend. But while Hanrahan is eligible to be activated from the disabled list April 29, Farrell isn’t making any guarantees that he will return as the closer. “I think we’ll get through the rehab assignments and get him back here before we address that,” Farrell said before last night’s series opener against the Oakland Athletics. “I think it’s probably a little bit premature to state anything along those lines.” In Hanrahan’s absence, Andrew Bailey is 3-for-4 in save opportunities and has struck out eight in five innings over five appearances. Like Hanrahan, Bailey is a two-time All-Star closer and yesterday was named AL co-Player of the Week, sharing the distinction with Red Sox first baseman Mike Napoli. For now, Hanrahan is concerned only with getting healthy. “I don’t feel it right now,” Hanrahan said. “Game intensity is a little bit different. But that was going to be one of the big tests, getting the slope (of the mound) out there. I think it went pretty well. Overall, I think it was a positive day.”