Boyle attended North Oldham High School in Goshen, Kentucky, where he played baseball.

[2] As a freshman for the Notre Dame Fighting Irish baseball team in 2018, Boyle pitched two innings in which he gave up four earned runs and eight walks.

[9] Boyle signed with the Reds, but did not play in a game in 2020 due to the cancellation of the minor league season because of the COVID-19 pandemic.

[10] He made his professional debut in 2021 with the Single-A Daytona Tortugas, posting a 3.55 ERA over 12+2⁄3 innings while missing time due to injury.

[17] He posted a 2–1 record and 2.08 ERA in 3 starts for the Double–A Midland RockHounds before he was promoted to the Triple–A Las Vegas Aviators.

[18] On September 17, 2023, the Athletics selected Boyle's contract to the 40-man roster and promoted him to the major leagues for the first time.