BOSTON -- Up early and feeling good about themselves, the Texas Rangers didn't see a disastrous fourth inning coming toward them Saturday afternoon.
Colby Lewis said he was getting better after laboring some early.
The offense was clicking against Erik Bedard.
But the game took a sharp U-turn after a squeeze bunt turned into a double play to end the Rangers' fourth. Boston's impressive lineup broke through for eight runs in its half of the inning, and the Red Sox rolled to a 12-7 victory.
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"It wasn't coincidence," manager Ron Washington said. "It turned the momentum."
Carl Crawford's grand slam highlighted the rally, but his at-bat was made possible when pinch-hitter Mike Aviles singled with two outs off Yoshinori Tateyama to break a 3-3 tie.
It was the key mound sequence for the Rangers, who got only 3 1/3 innings out of Colby Lewis (11-10) before poor pitch location and a high pitch count caught up to him.
The Rangers had given him a 3-0 lead. David Murphy drove in the first run, in the second inning, with a two-out single to score Adrian Beltre. Michael Young and Beltre brought in two more in the third.
Boston finally punched through in the third with a Jed Lowrie RBI single with two outs, but the Rangers had Bedard in trouble again in the fourth.
Craig Gentry, though, popped up a bunt with Yorvit Torrealba coming hard from third. Instead of leading 4-1, the Rangers were about to get run over.
Reddick singled to start the Red Sox's fourth, and Jarrod Saltalamacchia followed with a two-run shot to tie the game.
After Jacoby Ellsbury lined out to left field, Dustin Pedroia hit a sharp single to left on Lewis' 89th and final pitch.
The early hook didn't sit well with Lewis, who thought that he had turned the corner. He also wasn't pleased with a call by plate umpire Gary Darling on the pitch that preceded Saltalamacchia's 14th homer of the season.
"I had Salty punched out on the 2-2 pitch, and he didn't call it," Lewis said. "It was a 3-3 game. I felt like my stuff was coming in more as it went on, but not everyone felt that way."
In came the right-handed Tateyama, who worked carefully around left-handed sluggers Adrian Gonzalez and David Ortiz and tried to attack the right-handed-hitting Youkilis and Aviles.
Tateyama retired Youkilis between intentional walks to Gonzalez and Ortiz but fell behind Aviles, who was hitting because Lowrie had to leave the game with a sore shoulder.
Aviles lined a 3-1 pitch into right field to give the Red Sox their first lead at 4-3 and to extend the inning. Crawford followed and put the game out of reach with his fourth career grand slam.
It was the seventh homer allowed by Tateyama, all to left-handed hitters. But he was in the game to get Youkilis and Aviles.
"I should get outs against right-handed hitters, and I could not do that," Tateyama said. "That led to the results."
Boston added three runs in the sixth against Mark Hamburger, but Lewis has allowed 16 earned runs in his past three starts covering 151/3 innings.
"I don't get concerned," Washington said. "He had another bad outing. He's healthy. He just needs to get the ball down. ... If you keep giving these guys opportunities with runners in scoring position, they're going to come through."