He’s left-handed pitcher Bailey Horn, and like all effective pitchers, he was let go by the Chicago White Sox. Prior to his time with Boston’s plain counterparts, he spent time in Craig Breslow’s pitching lab with the Cubs.
What position does he play?
He’s a freak, an absolute mutant, one of the weirdest beings in this realm: a left handed reliever.
Is he any good?
He was designated for assignment by the White Sox, who own the league’s 27th-best bullpen ERA, so probably not. He’s a reliever though, and sometimes something as simple as moving six inches to either side on the rubber can turn a career journeyman into a lockdown reliever, so it’s worth taking a look.