Have you seen their second half schedule? It's tough. Right now, they're going through the same stretch of games that the Sox get in August.
After the break, the Rays will have 66 games left. Of those games, only 28 will be at home. At the break, they will have played an astonishing 53 of their first 96 games at home. That leaves 28 home games and 38 road games left in their schedule. Considering they're .500 on the road, that doesn't bode well for them.
Not to mention their road games aren't exactly easy. 6 @ TOR, 4 @ BOS, 6 @ NYY, 3 @ BAL, a 6 game West Coast Trip vs the NL West (2 @ ARI, 4 @ LAD), a 10 game west coast trip (3 @ OAK, 4 @ LAA, 3 @ SEA). Plus a rainout makeup game @ KC for 1 game on an offday between two home series, so even in their homestand they're traveling.
They've been playing well, but they've got a tough second half.
Especially when the Sox have more home games (34) than away (31) in the 2nd half.