Avisail Garcia was supposed to break out and establish himself as one of the American League’s best young players this season. Instead, 2014 has been a season of injury, pain and recovery. But maybe there’s some light at the end of the tunnel for Garcia, who was ruled out for the season after tearing the labrum in his left shoulder April 9. Garcia is taking one-handed swings with his left arm and said all he’s feeling is some tightness. There haven’t been any setbacks, and Garcia thinks the next step is a rehab assignment, though it’s unclear when that would be. “Everything has been positive,’’ Garcia said. ‘‘They know what they’re doing, so they don’t want me to get hurt again. They just tell me to relax, easy, so now I’m good. They [checked] me out yesterday, and nothing hurts.” If and when Garcia goes on a rehab assignment, it probably won’t be brief. “Everybody’s different,” White Sox manager Robin Ventura said. “On the other hand, you don’t necessarily want a guy down there exposing him to that as much if he could be up here doing it. What’s the right time? I don’t know.” It’s not flying U.S. Cellular Field is known as one of the AL’s best home-run parks. But in 2014, the stadium isn’t living up to that reputation.