A southpaw who’ll soon turn 34, Runzler has appeared in five big league seasons, though he hasn’t been a substantial contributor since 2013. All told, he owns a 3.89 ERA with 9.7 K/9 and 5.4 BB/9 over 76 1/3 innings at the game’s highest level.
Runzler has mostly toiled at Triple-A and in the Atlantic League over recent years, but did briefly crack the bigs with the Pirates in 2017. He possesses mid-nineties heat from the left side, but hasn’t consistently been able to command it. In 2018, he threw 48 innings of 2.81 ERA ball with the Sugar Land Skeeters, racking up 58 strikeouts but also doling out 27 free passes.
Boston fans clamoring for some bullpen help likely won’t be appeased by this addition, any more than they were by the club’s prior winter moves. Runzler joins Colten Brewer, Zach Putnam, and Jenrry Mejia as low-risk relief candidates that have been brought on board this winter.