Kimbrel is expected to have surgery Monday for a medial meniscus tear.
Red Sox manager John Farrell said Ziegler would share the closing duties with RHP Koji Uehara, who got the save Friday despite allowing a solo homer to Evan Longoria. Kimbrel is widely regarded as one of the best closers in baseball, and Smith had a tremendous rookie season for Seattle past year, striking out 92 in 70 innings with a 2.31 ERA and a 4.18 strikeout-to-walk ratio.
Ziegler was an excellent pick-up for the Red Sox and their battered bullpen.
He had been acting as Arizona's closer, and had performed well in the role, picking up 48 saves over the last two seasons.
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Martinez, 33, batted. 283 with one home run and three RBIs in 32 games for the Indians this season. "I don't think anybody in here is going to admit to that - I know I won't".
Ziegler and his submarine style continue to lock down games despite his lack of power stuff, as he's converted 19 of 20 save chances to go along with a 2.72 ERA this season. Dustin Pedroia is right there as well on 105 hits with 37 RBI and 54 runs so far.
Regardless, it was convenient the Red Sox were already looking for another late-inning reliever before Kimbrel got injured. He started out with promising numbers, a 2.50 ERA in rookie ball in 2013, but that mark has consistently grown, up to a career worst 3.91 during his 2016 campaign.