Mitch Moreland signed as a free agent with Boston in the off-season. One-year deal, $5.5 million. Both parties have to be thrilled with how this has worked out. Moreland, the ex-Mississippi State star from Amory, has been what Red Sox manager John Farrell calls “a bedrock in our lineup,” which no longer features David Ortiz. The Red Sox are 43-35, tied for first in the American League East with the surprising New York Yankees. Moreland, a lefty-hitting first baseman, is batting .275 and is tied for the club lead with 12 homers and 41 RBIs. He leads in slugging percentage at .486. He will be a free agent again after this season, and his performance has no doubt boosted his market value. When Moreland first signed, speculation was he would platoon at first base with Hanley Ramirez and also get some at-bats as the DH. As it has turned out, Moreland, a Gold Glove winner last year with Texas, has been the regular first baseman essentially from Day 1, appearing in 72 of the team’s 78 games. And there’s this: For the last couple of weeks, he has played with a broken big toe. “It’s a lot more fun playing than it is sitting and watching. That’s the way I look at it,” Moreland told the Boston Herald. That’s the definition of a gamer.