BOSTON — Will Middlebrooks had a solo homer among his three hits and drove in two runs, Franklin Morales gave Boston another decent start as the fill-in for Josh Beckett and the Red Sox beat the Atlanta Braves 8-4 on Saturday night.

Dustin Pedroia added three hits, a walk and had two RBIs for Boston, which won for the eighth time in 10 games to ensure a winning interleague record for the eighth straight season. The Red Sox improved to 10-7 against NL opponents.

Morales (1-1) gave up three runs — two earned — on seven hits, striking out eight and walking one. He fanned a career-best nine in five innings last Sunday night against the Chicago Cubs, when he took Beckett's turn in the rotation after the right-hander was placed on the 15-day disabled list with shoulder inflammation.

Braves starter Randall Delgado (4-8) was knocked out after retiring only four batters, giving up four runs on six hits.

Trailing 1-0 in the first, Boston scored two runs when Adrian Gonzalez had an RBI single and Middlebrooks followed with a run-scoring double off the Green Monster.

The Red Sox chased Delgado in the second and increased it to 4-1 on Pedroia's two-run double to the gap in left-center. Cristhian Martinez relieved with the bases loaded and got Gonzalez to bounce into an inning-ending double play.

Middlebrooks hit Martinez's first pitch of the third into the Monster seats, making it 5-1. It was the ninth homer of the season for the rookie third baseman, who has made it hard for manager Bobby Valentine to keep him out of the lineup.

Middlebrooks has gone 10 for 14 in his last five games with three homers, three doubles and nine RBIs, and is hitting .381 in his last 26 games.