With a look forward as well as back, I think Ryan Brasier has been the most unsung pitching surprise . He has worked his way into the 8th inning setup man role. If he can keep up his effectiveness , he could be big help in the playoffs.
In the position player unsung role, I will take Eduardo Nunez in a very close call over Brock Holt. Never Nunez to all his haters, he has played virtually full time at two positions where the expected incumbents (Pedroia/ 21 yr old Devers) have not been able to get or stay on the field. No way Eduardo was expected to play a full season hit above .250, 30 XBH and could have 50 rbi's by year end. Brock is doing what we saw Brock do a couple years ago and no question his value but he is playing to what could be expected of him, more so than Nunez.