[9] Overton made 5 starts with Oakland in 2016, going 1–3 with an 11.47 ERA, giving up 12 home runs in 24+1⁄3 innings pitched.

He made one start for the Padres before he was removed from the 40–man roster and sent outright to the Triple–A El Paso Chihuahuas on August 31.

In 2018, Overton played for the rookie–level Arizona League Padres, Double–A San Antonio Missions, and El Paso.

[12] Overton made 25 appearances (22 starts) for El Paso in 2019, registering a 10–5 record and 5.46 ERA with 103 strikeouts across 115+1⁄3 innings pitched.

[15] On December 21, 2020, the Rakuten Monkeys of the Chinese Professional Baseball League signed Overton for the 2021 season.

[17] In 12 games (11 starts) for the Triple–A Albuquerque Isotopes, he struggled to a 2–7 record and 8.60 ERA with 39 strikeouts in 45.0 innings of work.