BOSTON — The Boston Red Sox are rolling into Houston for their first matchup against the champion Astros since getting bounced by them last postseason. J.D. Martinez hit a tiebreaking, two-run homer over the Green Monster and out of Fenway Park, and the Red Sox beat the Toronto Blue Jays 6-4 on Wednesday to complete a three-game sweep. The win finished a 5-1 homestand for the AL East leaders, who own the best record in the major leagues at 39-17. “It’s been great to be able to come in and sweep Toronto, now we’re going to be able to face a tough opponent in Houston,” Martinez said.