Rolison was invited to the Rockies' major-league spring training Wednesday.
Rolison spent a majority of the 2019 season pitching for High-A Lancaster, recording a 4.87 ERA, 1.44 WHIP, and 118:38 K:BB in 116.1 innings. Drafted by Colorado 22nd overall in 2018, the highly-rated pitching prospect has earned praise for his excellent command while pitching in an extremely hitter-friendly ballpark for Lancaster. Rolison will have the opportunity to learn from the big-league coaching staff this spring before likely returning to the minors for more seasoning.
Rolison threw six scoreless innings in his debut for High-A Lancaster, allowing two hits and zero walks while striking out seven.
Rolison allowed just one earned run while striking out 14 through three starts (14.2 innings) with Low-A Asheville to start the season, leading to a quick promotion to the California League. He doesn't have electric stuff, but he has an advanced repertoire and excellent command. His numbers will likely suffer from pitching half his games in the extremely hitter-friendly ballpark in Lancaster.