OAKLAND -- The A's have acquired Baltimore Orioles closer Jim Johnson in exchange for infielder Jemile Weeks and a player to be named later.

The A's announced the trade in a release Monday night.

Johnson, 30, has saved a major league-leading 101 games over the past two seasons. He was 3-8 with 50 saves in 59 opportunities and a 2.94 ERA in 2013. The 6-foot-6, 240-pound right-hander posted a club-record 51 saves in 54 opportunities and a 2.49 ERA in 2012 for the Orioles and was an American League All-Star selection.

Pitching parts of six seasons with Baltimore, Johnson owns a 18-26 record and 3.11 ERA. He has 122 saves in 150 opportunities.

Baltimore Orioles closer Jim Johnson delivers against Oakland Athletics’ Chris Carter, Sept. 16, 2012, at O.co Coliseum in Oakland, Calif.
Baltimore Orioles closer Jim Johnson delivers against Oakland Athletics' Chris Carter, Sept. 16, 2012, at O.co Coliseum in Oakland, Calif. (D. ROSS CAMERON)

Weeks, the A's first-round selection in the 2008 draft, batted .271 with 19 doubles, 10 triples, four home runs and 40 RBI in 130 games for Triple-A Sacramento last season and tied for the team lead in stolen bases with 17 in 19 attempts. He played parts of the past three seasons with Oakland. His best season came as a rookie in 2011 when he batted .303 with 26 doubles, eight triples, two homers, 36 RBIs and 22 steals in 97 games.