Has a lesser know player on your team been great this year?

I love the Red Sox and we've had some rookies and lesser know players have an impact. Darnell Mcdonald spent 12 years in the minors and at age 31, this is his 1st time being a regular on a team. He's been solid hitting and fielding. Also Daniel Nava and Ryan Kalish have been great so far. Also pitcher Felix Doubront has been great and he has the potential to be a great pitcher. Bill Hall has done way more than I expected of him to do. Is there a player on your team who has contributed more than you had expected?