Kason Gabbard allowed two hits in seven innings to raise his mark to 4-and-0.
Gabbard has allowed three or fewer hits in his four straight starts.
This one was in doubt until Boston erupted with seven runs in the seventh, its biggest scoring outburst of the season. Crisp singled in two runs before Eric Hinske doubled in the last two. The first three runs of the inning scored on bases-loaded walks.
John Danks fell to 6-and-7.