BOSTON -- Red Sox closer Joel Hanrahan, who has a had rough go of it early, is day to day because of a sore right hamstring that may be contributing to throwing off his mechanics on the hill, manager John Farrell said Sunday.
Farrell said Hanrahan tweaked the hamstring in his second appearance of the season, when he pitched a scoreless inning against the Yankees in New York on April 3.
The right-hander has been receiving treatment on it the past week but thought he could pitch through it, Farrell said, which appeared to be the case, given that his velocity was in the high-90s.
"It's a manageable situation,'' Farrell said, "but it's clearly had an effect on his ability to repeat his delivery.
"Yesterday, when we spoke about, 'Is this mechanical?' Clearly the right hamstring soreness is in the back of his mind and looking at some video again this morning, it looks like his right leg has collapsed a little bit in his delivery, it's caused him to work a little bit more uphill or a little bit more side to side, and not have that same effectiveness.''
Hanrahan walked the only two batters he faced Saturday before being pulled in the ninth inning of a tie game with the Tampa Bay Rays.
In his previous outing, Hanrahan suffered a blown save, giving up five runs in 2/3 of an inning in an 8-5 loss to the Baltimore Orioles.
In the interim, Farrell said, Andrew Bailey will be the closer. Bailey has allowed just one hit while striking out seven in five appearances (4 1/3 innings).