He’s Nick Robertson, and the Red Sox just received him from the Dodgers in exchange for Kiké Hernandez.
What position does he play?
He’s a pitcher with about ten career Major League innings, all out of the bullpen where he’ll likely remain for the foreseeable future.
Is he any good?
He’s a reliever, so that’s hard to say for sure. In his ten Major League innings, he has a 6.10 ERA, which by all accounts isn’t very good. In his 28 AAA innings this year, he has a 2.54 ERA and a 50% ground ball rate, which is very good.