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Since Craig Kimbrel (left) arrived in 2016, the Red Sox bullpen has ranked in the upper third in the majors in ERA and strikeout rate. And with the addition of Joe Kelly to the ’pen last year, the Sox now have one of the fastest-throwing bullpens in baseball. Kimbrel (98.7 mph) and Kelly (99.2 mph) ranked fifth and second, respectively, in average fastball velocity by relievers in 2017. Aroldis Chapman was No. 1 at 100.2 mph.
How Red Sox relievers have been on the rise over the last five years:
2017
• Average fastball velocity: 95.