"It's exciting for me -- I appreciated the time that I had away, but this is home for me," said Breslow, who went to Yale and grew up in Connecticut. "For better or for worse, this is Boston. I don't think there's any better place to be successful."
Breslow didn't waste any time making an impact and relieved starter Aaron Cook in the fifth inning of Wednesday's 7-5 loss to Detroit. He had two strikeouts and allowed one hit in 1 1/3 scoreless innings.
"He looked good, everything was moving," said catcher Jarrod Saltalamacchia. "He just had really good stuff, a sinker in to lefties, a changeup as well as a cutter, everything was working. It was fun to sit back and catch that."
Acquired from the D-backs on Tuesday in exchange for reliever Matt Albers and outfielder Scott Podsednik, Breslow gives the Red Sox another left-handed option in the bullpen. He's pitched for four teams since a 13-game stint with the Sox in 2006.
"You know, that's a good addition," said manager Bobby Valentine. "Breslow, first time in, had no ill effects from the cross-country flight [from Los Angeles]. Threw strikes, quality. I like what I saw."
To make room for Breslow on the roster, Boston had to option righty Clayton Mortensen back to Triple-A Pawtucket.
Mortensen, who earned the win Tuesday with 2 2/3 strong innings, has been the victim of a roster crunch several times this season.
It certainly isn't reflective of his performance. Mortensen, acquired in the trade for Marco Scutaro back in January, is 1-0 with a 1.17 ERA in 10 games for Boston.
Breslow was 2-0 with a 2.70 ERA in 40 appearances with Arizona this season.