[1] Following the season's end, he was selected by the Chicago Cubs in the fourth round of the 2018 Major League Baseball draft.

[2] Roberts signed with the Cubs and made his professional debut with the Eugene Emeralds, posting a 5.40 ERA over 15 innings.

[5] Roberts began the 2021 season with the Tennessee Smokies and was promoted to the Iowa Cubs in early August.

[9] He made his MLB debut on April 9, throwing one scoreless inning of relief versus the Milwaukee Brewers.

[13] He made 12 scoreless appearances split between the rookie–level Arizona Complex League Cubs, Double–A Tennessee, and Triple–A Iowa, striking out 13 in 11+1⁄3 innings of work.