Rays ace Tyler Glasnow blames partially torn UCL, flexor tendon strain on MLB's new foreign substances policy | CBS Sports Headlines Rays ace Tyler Glasnow blames partially torn UCL, flexor tendon strain on MLB's new foreign substances policy Glasnow, who left his start on Monday because of elbow inflammation, will … Continue reading Rays ace Tyler Glasnow blames partially torn UCL, flexor tendon strain on MLB's new foreign substances policy