He continued to the dugout where he was congratulated by teammates.
The rally continued when the Yankees loaded the bases with one out on singles by Eduardo Nunez and Lyle Overbay and a walk to Chris Stewart before Gardner tripled.
Rodriguez was one of four Yankees hit by pitches, but his was the only one that appeared to be intentional.
On Rodriguez's first at bat, Dempster "pitched much like Ryan has done (in) many starts," said Boston manager John Farrell, who denied that Dempster was throwing at Rodriguez. "He established his fastball. There are hitters in the lineup and he's got to establish it in. We saw later on when he doesn't establish his fastball in. Rodriguez gets his arms extended and he drives the ball out to center field."
Dempster's first pitch went behind Rodriguez's knees as fans chanted "You're a cheater!" The next two pitches were inside before the fourth pitch struck Rodriguez. He walked slowly to first base, accompanied by a trainer and staring at Dempster but not making a move toward the mound.
In 12 games since his season debut after recovering from hip and quadriceps problems, Rodriguez is batting .319 with two homers and six RBIs.
Boston had taken a 2-0 lead in the first on a sacrifice fly by Jonny Gomes and an RBI single by Saltalamacchia. New York tied it in the second when Rodriguez was hit, took third on a double by Curtis Granderson and scored on a single by Nunez. Overbay followed with a sacrifice fly.
Rodriguez's run-scoring groundout gave the Yankees a 3-2 lead in the third before the Red Sox tied it in the bottom of the inning on an RBI groundout by David Ortiz.
The Red Sox took a 5-3 lead in the fourth on Stephen Drew's sacrifice fly and Will Middlebrooks' 10th homer. A bases-loaded walk to Daniel Nava boosted the lead to 6-3 in the fifth.
After the four-run sixth, the Yankees added RBI singles by Mark Reynolds in the seventh and Stewart in the ninth.
"Today kind of brought us together," Rodriguez said. "Joe's reaction was amazing. Every single one of my teammates came up to me and said hit a (homer)."
NOTES: New York's Alfonso Soriano went 0 for 6 after batting .682 with five homers and 18 RBIs in his previous five games. ... Yankees SS Nunez left the game in the sixth with a tight right hamstring. ... Boston 1B Mike Napoli missed his second straight game with plantar fasciitis in his left foot. ... Yankees SS Derek Jeter (strained right calf) increased his movement in fielding drills on Sunday, including some spin moves on grounders up the middle, during his third day of workouts at the team's complex in Tampa, Fla. Jeter took batting practice, but isn't running the bases. Girardi said Jeter won't be ready to return for Tuesday's doubleheader against Toronto. ... Dempster is 0-6 with a 7.57 ERA against the Yankees in his career.
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