Every team needs one ... some thoughts
Hanley Ramirez - probably the favorite. Players and managers vote, and there is not much evidence that the statistical revolution has hit that entire community. Ramirez has the most impressive counting stats on the team, regardless of whether he has provided an overall positive contribution or not.
Clay Buchholz - actually leads the team in fWAR (3.1), 3rd in bWAR (2.4). Outside of a shaky April has been very very good. Still not a great record, and Sale and Kluber have been better among starters without the record to show for it.
Mookie Betts - alas, life at the position Mike Trout plays. Had a terrific first half 2.7/3.9, tops among position players for the Sox. Now in an All-Star game with proper priorities (a game that doesn't count and is a showcase for the best of the sport), he gets in somehow.
Xander Bogaerts - the field at shortstop is thinner, and Bogaerts has had a terrific season too. The stunning change in defensive bWAR (-0.9 in 2014 to +0.6 to date) is particularly encouraging. Strong choice to showcase the game's future as well.
Dustin Pedroia - another good choice to showcase the game's best. One hell of a bounceback season before going to the DL, although defensively not to the usual standard.
Brock Holt - Easiest guy to root for putting on the list. Has had a season to justify it too, although position would be tricky. He'd be a fun guy for the 32nd (or whatever the number is) man balloting.
Koji Uehara, Junichi Tazawa - the managers put way way way way too many relievers on the roster relative to player value. But if you are going to do it, both have had excellent first halves. Yeah, Uehara is not the guy he was in 2013, but that guy was superhuman.
MY PICKS: Bogaerts, Betts and Holt (final man ballot)
MY GUESS: Uehara, Pedroia (since he's on the DL, easy selection to make and replace), maybe Bogaerts