[1] Martínez did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.

[2] Martínez began the 2021 season with the Single–A Visalia Rawhide, but underwent Tommy John surgery after only 7 starts.

In 20 games split between the rookie–level Arizona Complex League Diamondbacks, High–A Hillsboro Hops, Double–A Amarillo Sod Poodles, and Triple–A Reno Aces, he accumulated a 3.32 ERA with 62 strikeouts in 38.0 innings of work.

[9] He was promoted for a second time on July 7, making his MLB debut the same day, allowing two runs in one inning against the Pittsburgh Pirates.

[10][11] In 10 games during his rookie campaign, Martínez struggled to a 12.60 ERA with 14 strikeouts across 10.0 innings pitched.