The Arizona Fall League rosters were released Wednesday, and the Rockies have seven of their top prospects on the Salt River Rafters roster for the 2019 season that begins Sept. 18.
Colton Welker, widely regarded as the organization’s best positional prospect not named Brendan Rodgers, headlines the list. For Double-A Hartford this season, the third/first baseman hybrid batted .254 with 10 homers and 53 RBIs while missing about a month due to injury.
Right-hander Ryan Castellani is the most prominent pitcher on the list, although the 23-year-old had his season in Triple-A Albuquerque cut short after 10 starts due to elbow issues.