Probably Baltimore? I'll just say it AGAIN-- I don't care if Boston is playing .600 baseball, they are way over their heads and they will tank out of first, past second and into third or fourth. Take away the 6-2 v Tampa, who they've owned and the 4 free wins against Houston, who were beyond bad at the time and that percentage comes a little closer to Earth. Yes I see the runs scored/ runs allowed. Mind boggling and it won't sustain.
Boston is not the team to catch for the division. Baltimore is. The wild card? The #2 team in the west, the Yankees, maybe the Tribe or Royals. I don't even see Boston as a playoff team.