Starlin Castro estimated he’s running at 90 percent now, but the Cubs shortstop wouldn’t put a timetable on when he’ll be able to play in a game again. “I don’t know,” Castro said Tuesday, “but we’re getting closer.” Castro went through another series of tests at Cubs Park, taking batting practice, running (not the bases), fielding groundballs and getting treatment for the strained right hamstring that has sidelined him since March 2. “I feel pretty good,” Castro said. Less than two weeks until Opening Day, the Cubs are monitoring several situations and trying to get healthy. Manager Rick Renteria said he hopes to see Mike Olt play third base on Wednesday night against the Colorado Rockies in Scottsdale. A sore right shoulder has limited Olt to first base and designated hitter this spring. He’ll need to show he can play third base – and make a strong final push – if he’s going to make this team. He did blast his fourth Cactus League homer during Tuesday night’s 7-6 loss to the Texas Rangers at Surprise Stadium, finishing with a walk and three RBI.