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The start of Mujica's Red Sox career has closely resembled the end of his tenure in St. Louis.
The Red Sox signed Edward Mujica to a two-year $9.5 million contract with the idea that he could be an effective set-up man in front of Koji Uehara.
Mujica was the St. Louis Cardinals closer for the majority of 2013, converting 35 of 37 save opportunities through August. However, in September everything changed. Mujica blew two of four save chances and finished the month with a horrific 11.05 ERA and .514 batting averaged against. He lost his job and was a non-factor for the Cardinals in the postseason.
On March 20 Ian Browne of MLB.com wrote the following:
The Red Sox have already seen enough from right-hander Edward Mujica to think he will pitch like he did for the first two-thirds of last season, instead of the fatigued hurler who lost his closing job with the Cardinals.
"It wasn't injury related. It was more fatigue," said manager John Farrell. "Looking back at his usage, there were a number of times he went four days in a row, a couple other times he went three days in a row, and, I think, just physically, he hit a little bit of a wall. The power to the stuff declined through the course of the year."
Unfortunately for Boston, Mujica's struggles have continued. Despite never pitching on consecutive days, the right-hander has allowed 14 hits and 10 earned runs in just nine innings. His 10.00 ERA, 2.00 WHIP and .341 BAA have led to Mujica being used only once since April 24.