The Red Sox bullpen had a rough start to 2012, compiling an 8.64 ERA in April. However, the bullpen turned it around after April, sporting the best bullpen ERA from late April through May.
Although the bullpen had rough stretches during the rest of the season, there is reason to believe the Red Sox unit will be a strength heading into 2013. Andrew Miller, Junichi Tazawa, Andrew Bailey, Franklin Morales, Craig Breslow and Alfredo Aceves will all return to the bullpen this season.
However, the Red Sox acquired even more firepower for an already formidable bullpen, signing Koji Uehara from the Texas Rangers. Uehara was phenomenal for the Rangers last season, pitching for a 1.75 ERA and a ridiculous 0.64 WHIP. Uehara will be a solid set-up man for the Red Sox bullpen this-coming season.
In addition to acquiring Uehara, the Red Sox traded for Joel Hanrahan, the Pittsburgh Pirates closer. Hanrahan has made the All-Star team the past two seasons as a closer, and he saved 36 games with a 2.72 ERA last season.
Barring more moves, the Red Sox bullpen will look like this heading into Spring Training:
RP: Andrew Miller
RP: Junichi Tazawa
RP: Franklin Morales
RP: Craig Breslow
RP: Alfredo Aceves
SU: Andrew Bailey
SU: Koji Uehara
CL: Joel Hanrahan