He’s Mauricio Llovera. The Red Sox acquired him late last night from the Giants. They sent Marques Johnson to San Francisco as compensation.
What position does he play?
Like just about every player the Red Sox have acquired, he’s a reliever.
Is he any good?
He was DFA’d by the Giants and hasn’t been able to establish himself as a full-time major leaguer over the past few years, so not yet. That doesn’t mean there isn’t hope for him though. He comes with a mid-90s sinker and a low-80s slider with a lot of sweep.