Tuesday should have been about Martin Perez’s weird affection for putting the leadoff man on base and then eliminating him with a double play. Or about Robinson Chirinos providing a little bit of offense from catcher. Or springtime in Boston, for that matter. Instead, it once again became about an injury. In particular: Adrian Beltre’s left quadriceps muscle. And that injury hung over the Rangers clubhouse following a 10-7 win over Boston like 3-day-old salted cod. Beltre, who on Monday turned 35 and tied Mike Schmidt for the fifth-most games ever at third base (2,212), apparently injured the quad on a fifth-inning double. He remained in the game through the end of the inning, then retreated to the clubhouse and didn’t return. The Rangers know only two things about the injury: It’s not in the same area as the quad soreness he dealt with in spring training, and he is headed back to Texas for an exam by team physician Dr. Keith Meister. It will probably include an MRI exam on Wednesday and very well could force him to the disabled list. At the time he left, with the Rangers leading 8-1, it could have been waved off as being nothing more than cautious. That apparently wasn’t the case. “He aggravated it,” manager Ron Washington said. “At the time, we had a big lead. There was no reason to leave him in there. We are just doing the right thing. He didn’t really say anything. He didn’t have to. I don’t know much. We will just have to wait and see what Dr. Meister has to say.” Beltre was consistent in his reluctance to speak. He declined to speak with the media after the game, citing his lack of information about the situation. If Beltre requires a DL assignment, the Rangers would probably look to Round Rock’s Kevin Kouzmanoff, a five-year veteran who was the last player cut at the end of spring. The Rangers sent Kouzmanoff to Round Rock because they had to keep multiple middle infielders and extra catchers because of injuries at second base and catcher.