According to the Pythagorean Win Expectation, which is based on runs scored vs runs allowed, the Red Sox have been getting very unlucky this season.
Actual Wins/Pythagorean Wins
TB: 35/33
NYY: 34/34
BAL: 30/34
TOR: 31/34
BOS: 29/32
So the Rays and O's are getting pretty lucky, and the Jays and Sox are getting s*** on a bit thus far this year.