Overton was then drafted by the Oakland Athletics in the second round of the 2013 Major League Baseball draft.[3][4] After signing, Overton underwent Tommy John surgery, a development which significantly lowered his signing bonus.[5] He returned in 2014 and made his professional debut with the Arizona League Athletics. He was later promoted to the Vermont Lake Monsters, where he finished the season.[6] Unfortunately, the surgery did affect his fastball velocity, which dropped from mid-90s to high-80s.[7] Overton split the 2015 season with the Class A-Advanced Stockton Ports and the Double-AMidland RockHounds. He began the 2016 season with an 8–4 record and 3.01 earned run average with the Triple-ANashville Sounds,[8] before being promoted to the Athletics to make his major league debut on June 25, becoming the 11th Athletic to make a start during 2016.[9] Overton made 5 starts with Oakland in 2016, going 1–3 with an 11.47 ERA, giving up 12 HR in 24.1 innings pitched. Following the signing of infielder Adam Rosales, Overton was designated for assignment on January 25, 2017.[10]
Seattle Mariners
On January 26, 2017, Overton was traded to the Seattle Mariners in exchange for minor-leaguer Jason Goldstein, adding to Seattle's starting pitching depth.[11] Overton pitched to a 6.31 ERA for Seattle and was designated for assignment.
San Diego Padres
On June 19, 2017, Overton was claimed off waivers by the San Diego Padres. He was removed from the 40–man roster and sent outright to the Triple–A El Paso Chihuahuas on August 31.
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. He elected free agency following the season on November 4, 2019.[12]
Arizona Diamondbacks
On March 11, 2020, Overton signed a minor league deal with the Arizona Diamondbacks. Overton was released by the Diamondbacks organization on May 22, 2020.[13]
On February 18, 2022, Overton signed a minor league contract with the Colorado Rockies.[15] 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. On July 8, Overton retired from professional baseball.[16]
Personal life
Overton and his wife, Morgan, have one son named Oliver Ray who was born in April 2017.[17]