[1] He made his professional debut in 2015 with the Dominican Summer League Twins where he was 0–1 with a 2.45 earned run average (ERA) in four starts.

[1] Graterol started 2018 with the Cedar Rapids Kernels (with whom he was named a Midwest League all-star)[4][5][6] and was promoted to the Fort Myers Miracle in June.

[10] He made his major-league debut that day versus the Detroit Tigers, striking out the first batter he faced (Dawel Lugo) and pitching a scoreless inning in relief.

[12] On February 10, 2020, the Twins traded Graterol, Luke Raley, and the 67th pick in the 2020 Major League Baseball draft to the Los Angeles Dodgers for Kenta Maeda, Jaír Camargo, and cash considerations.

[18] In 2024, Graterol began the season on the injured list with a sore shoulder[19] and didn't rejoin the active roster until August 5.

[12] Graterol underwent labrum surgery after the series to address the shoulder issues that had plagued him during the season, putting his status for 2025 in doubt.