KANSAS CITY, Mo. -- Justin Maxwell has provided a huge boost for Kansas City since coming over from the Astros.
The Royals have won 15 of their past 17 games to move seven games above .500, matching their best record of the season. They are 4 1-2 games back in the wild-card standings.
"It's just team chemistry, no matter who's at the plate or who's on the mound, we all have each other's backs," Maxwell said. "That's the main thing."
Maxwell, who the Royals acquired on July 31 from the Astros for a minor league pitcher, homered leading off the second.
"I led off, just trying to get on base, not do too much," Maxwell said. "It was just one good at-bat after another good at-bat. I think that's how you roll."
Maxwell was making his first start in center and only his fourth start since joining the Royals, but manager Ned Yost promises he will be seeing plenty more action.
"He's got the opportunity to change the game with one swing," Yost said. "We'll keep running him out there."
Peavy, who was making his second Red Sox start since being acquired in a July 30 trade from the Chicago White Sox, yielded singles to Maxwell, Mike Moustakas and Alcides Escobar to start the inning. Escobar's RBI single finished Peavy.
"With the way Jake had settled in, he had good innings in the fourth and fifth, and we'd gained momentum for ourselves, he probably had one inning left with his pitch count," Red Sox manager John Farrell said. "I'm not going to say it was surprising, but he left some balls up and they made him pay.
"The put away pitch was a challenge for how they put the ball in play and go the other way. We just couldn't stop the momentum in the sixth."
Eric Hosmer's two-run single with two outs off Britton put the Royals on top 7-6. David Lough contributed a sacrifice fly, while Billy Butler doubled home Hosmer. Maxwell's second single in the inning scored Butler with the final run.
That ended Santana's night. He gave up six runs on nine hits, including David Ortiz's 22nd home run in the third, in 3 2/3 innings, his shortest outing of the season.
"It's the best feeling," Santana said. "It doesn't matter how we got there, we won."
Peavy lasted five innings, plus three batters, allowing six runs on 10 hits.
"I just didn't make a whole lot of consistent pitches," Peavy said. "I had Maxwell 0-2 and threw him a changeup and he did a nice job (to start the sixth).
"You've got to win games when your offense scores six. I didn't feel good stuff-wise or control-wise. They battled and put the ball in play for being as free-swinging as they are. My stuff wasn't very sharp."
Francisley Bueno (1-0), who was just promoted Thursday from Triple-A Omaha, picked up the victory with 2 1/3 scoreless innings. He has two big league wins, both against the Red Sox.
Britton (1-1) was charged with the loss.
The Royals' 16-hit attack, included three hits each by Butler, Hosmer and Maxwell. Alex Gordon had two hits, including his 12th home run.
Greg Holland worked the ninth for his 31st save in 33 chances.
"It was a fantastic win," Yost said. "A night when Ervin didn't have his command, but our offense picked him up. Our bullpen again was dynamite."
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