Carter, who has yet to play in a Major League game, is in his first full season with the Red Sox organization after coming over in a trade that sent Wily Mo Pena to the Nationals in August.
The 25-year-old Carter got the nod over another potential candidate to fill the roster spot, PawSox teammate Brandon Moss, who was named the International League batter of the week. While both players were swinging hot bats, Red Sox manager Terry Francona said the move was a way to reward Carter for his strong play while letting Moss get more regular work while recovering from an appendectomy in early May.
"Chris was really swinging the bat well; so was Mossy," Francona said. "We weren't sure what the opportunities were for [Moss] to play every day here in the next week to 10 days. So letting him go play and keep playing gives Carter an opportunity to come to the Major Leagues.
"But we thought [Carter] hit himself into a place where we could reward him to come to the Major Leagues and maybe help us win a couple games."
Carter hit .316 with 10 homers and 35 RBIs this season for the PawSox, but his performance as of late is what sparked his promotion. He batted .385 with five home runs in his past 10 contests, a tear he partially attributes to Sox infielder Alex Cora.
"I've actually relaxed, and it's helped my bat speed increase," Carter said. "I'll give Alex Cora some credit. He was down there [at Pawtucket] three weeks ago. He told me to relax. I had my hands all different places over the game. He really pulled me aside and said, 'Hey, man, you can swing, you're just not driving the ball like you can.' And it worked."
Although he's filling Ortiz's spot on the roster, Carter said he knows his presence is not to take over where Ortiz left off.
"I don't think I'm a replacement right now," Carter said. "I don't think anyone can replace David Ortiz. All I'm going to do is help the team win any way I can."
Mark Remme is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.