Right-handed pitcher Kenny Koplove, 25, who pitched for the Can-Am League champion Sussex County Miners in 2018, had his contract purchased by the Rockies.
He was 7-4 with a 2.61 ERA in a season in which he relieved and started.
Koplove was 5-3 with a 3.19 ERA in 22 appearances as a reliever, working 36 2/3 innings, striking out 41 while allowing 30 hits and 20 walks.
He was moved to the rotation later in the season after the contracts of David Rollins and Alex Demchak were sold to MLB affiliates, and was 2-1 with a 2.17 ERA in nine starts. He allowed 21 hits and 21 walks, striking out 37 in 49 2/3 innings. The Miners were 7-2 in his starts.
He made two starts in the post-season — one against Trois-Rivieres in the semi-finals, and another against Quebec in the Championship Series, with a 1.72 ERA. The Miners won both game. Koplove also recorded a one-out save in Game 5 of the semi-final over Trois-Rivieres.
Miners manager Bobby Jones is a former big-league pitcher, who made his Major League debut as a member of the Rockies in 1997.
"Kenny's versatility was one of the main keys to our season," said Jones. "He filled so many roles and was so consistent. He showed great poise throughout the season and this opportunity is well deserved."
A 17th-round draft choice of Philadelphia out of Duke in 2015, Koplove was 5-7 with a 6.41 ERA in three minor-league seasons at the Low-A and short-season levels before being released by the Phillies.