Chicago Cubs third baseman Ian Stewart will get an MRI on his left quad this morning. Stewart felt a tweak Thursday after rounding first on a double in his first at-bat in an intrasquad game. First base coach Dave McKay asked Stewart for a little more effort while running. “I explained to him what happened, and he said ‘Oh, OK,” Stewart said. “I was like, ‘Trust me, I would’ve run hard on my first time on a baseball field in eight months.” Stewart missed most of the 2012 season with a left wrist injury that required surgery. “I hadn’t run the bases in a long time,” he said with a laugh. “It’s sore today so I’ll go get an MRI real quick for precautionary reasons, just to do everything we can to make sure it’s OK.” Stewart will get treatment and is likely to miss the start of Cactus League play. Getting back on the field and then getting injured after doubling “felt so good and so bad at the same time,” he said. “Just another thing,” he said. “I’m just glad it has nothing to do with my wrist and all the work I put in there. That’s OK. It is frustrating, but I don’t think it’s going to be anything too serious.” Stewart is hoping to win the third base job, and needs to have a good spring. “I’m trying to be positive about it,’ he said. “I’ve had enough stress and stuff to worry about since last June.”