[2] During his freshman year at Virginia, he appeared in 13 games with nine starts and went 1–3 with a 5.49 earned run average (ERA) and 37 strikeouts.

He was selected to play in the Arizona Fall League for the Surprise Saguaros following the season,[12] earning All-Star honors.

[15] He finished his rookie campaign making 15 starts for the Royals, posting a 4–6 record and 5.19 ERA with 55 strikeouts across 68.0 innings of work.

[16] In 2022, Lynch made 27 starts for Kansas City, registering a 4–13 record and 5.13 ERA with 122 strikeouts in 131+2⁄3 innings pitched.

[17] After missing the first two months of the 2023 season with a left shoulder strain, Lynch was placed back on the injured list with the same ailment on July 19, 2023.