Long attended Cactus Shadows High School in Cave Creek, Arizona.
He played baseball as a pitcher and an infielder, but did not make his school's varsity team until he was a senior.
[1] In 2010, The Arizona Republic named Long as an honorable mention on their All-Class 4A baseball team.
[3] As a freshman, Long pitched to a 1.62 earned run average (ERA) in 50 innings, though a broken wrist ended his season prematurely.
[4][6] In his junior year, Long developed warts on his pitching hand, which prevented him from throwing his changeup.
[20] On November 27, 2017, Long re-signed a minor league deal with the Nationals and received an invite to spring training.
In 25 games (19 starts) for Harrisburg, Long compiled a 6–8 record and 3.65 ERA with 77 strikeouts across 123+1⁄3 innings pitched.
[25] Following the end of his playing career, Long became a certified player agent, first working for Boras Corp then joining VaynerSports in March 2022.
[5] Kevin, who then was playing and coaching in the minor leagues, insisted that his son not pitch while he was young or throw a breaking ball until he was 16 years old.