Boston, MA (SportsNetwork.com) - Boston Red Sox closer Koji Uehara was activated off the 15-day disabled list Monday.

Uehara started the year on the DL, retroactive to March 27, because of a strained left hamstring. He made three appearances in spring training, the last on March 14, and pitched in a minor league rehab game on Saturday.

The 40-year-old right-hander earned his first All-Star nod last season and finished the campaign with 26 saves.

Boston opened a roster spot by optioning pitcher Tommy Layne to Triple-A Pawtucket. The 30-year-old lefty has appeared in four games for the Red Sox this season and has allowed three runs in 4 2/3 innings.