Sean Sullivan makes MLB debut with Colorado Rockies against Athletics

Sean Sullivan, a left-handed pitcher for the Colorado Rockies, made his MLB debut on June 12, 2026, at Las Vegas Ballpark against the Athletics. Despite feeling ill throughout the game, Sullivan delivered three scoreless innings before being pulled in the third inning. Manager Warren Schaeffer praised his effort, noting Sullivan had been sick prior to the game. Sullivan expressed pride in achieving his lifelong goal and plans to take better care of himself for future outings. He recorded a strikeout during his debut, calling it a favorite moment.

• 12:00 PMYahoo Sports — This Week in Purple: One day later, Sean Sullivan reflects on his MLB debut