Cade Horton, the potential future Cubs ace, may face a long injury that could impact the team's chances of competing for a World Series. Horton had an MRI exam that was "not good, not clean," according to ESPN's Jesse Rogers. The 24-year-old right-hander is set to meet with Dr. Keith Meister to determine his next steps, with the potential of Tommy John surgery looming. This comes after Matthew Boyd went on the injured list with a bicep strain. The injury is another setback for a struggling Cubs rotation, with Javier Assad being called up to start Tuesday's game against the Rays.