Red Sox add RHP Brad Ziegler to active Major League roster

Place Right-handed Pitcher Sean O'Sullivan on 15-Day Disabled List

The Boston Red Sox today added right-handed pitcher Brad Ziegler to the active major league roster. To make room, right-handed pitcher Sean O'Sullivan was placed on the 15-day disabled list (retroactive to July 9) with left knee patellar tendinitis. Ziegler will wear number 29 and will be available for today's series finale against the Tampa Bay Rays at Fenway Park beginning at 1:35 p.m.

President of Baseball Operations David Dombrowski made the announcement.

Ziegler, 36, was acquired by the Red Sox Saturday from the Arizona Diamondbacks in exchange for minor league right-handed pitcher Jose Almonte and minor league infielder Luis Alejandro Basabe. The right-hander is 2-3 with a 2.82 ERA (12 ER/38.1 IP) in 36 relief appearances this season, converting 18 of 20 save opportunities and finishing 30 games with 27 strikeouts and only one home run allowed. Originally signed by Philadelphia as a 20th-round selection in the 2003 June Draft, Ziegler is 32-24 with 81 saves and a 2.49 ERA (157 ER/567.0 IP) in 571 career appearances, all in relief with the Oakland A's (2008-11) and Diamondbacks (2011-16). Born in Pratt, KS, Ziegler converted 43 consecutive save opportunities from May 29, 2015 to June 20, 2016, the longest such streak in Arizona franchise history and the seventh-longest in major league history.

O'Sullivan, 28, has made five appearances (four starts) for the Red Sox in two stints with the club this season, going 2-0 with a 6.75 ERA (16 ER/21.1 IP). Boston has won each of his four starts, most recently a pair of 5.0-inning performances on July 8 against the Rays and July 3 versus the Los Angeles Angels of Anaheim. Originally selected by the Angels in the third round of the 2005 June Draft, O'Sullivan is 13-23 with a 6.01 ERA (216 ER/323.2 IP) in 71 games (56 starts) over parts of seven major league seasons with the Angels (2009-10), Royals (2010-11), Padres (2013), Phillies (2014-15), and Red Sox (2016). Signed by Boston as a minor league free agent on December 5, 2015, O'Sullivan has also made 11 starts at Pawtucket this season, going 6-2 with a 2.79 ERA (22 ER/71.0 IP) and 51 strikeouts against 10 walks.