Texas Rangers starting pitcher Corey Kluber exited Sunday's game after one inning of work against the Colorado Rockies.
John Blake, the Rangers' executive vice president of communications, announced Kluber was experiencing tightness in the back of his right shoulder. He'll be evaluated further on Monday.
The man nicknamed "Klubot" played for the Cleveland Indians from 2011-2019, winning the American League Cy Young award twice. He paced the league with a 2.25 ERA and 0.87 WHIP in 2017 and struck out an average of 246 batters per year from 2014-2018.