[3] He signed and spent his first professional season with the rookie-level Gulf Coast Marlins and Low-A Batavia Muckdogs, posting a 2–0 win–loss record and 0.93 earned run average (ERA) across 14 games played.

[4] In 2021, he returned to pitch for the Single-A Jupiter Hammerheads, High-A Beloit Snappers, and Double-A Pensacola Blue Wahoos, logging a 4–3 record and 3.61 ERA with 69 strikeouts in 52+1⁄3 innings across 29 games.

On August 14, 2022, Nardi was selected to the 40-man roster and promoted to the major leagues for the first time alongside Parker Bugg.

He made 13 appearances for the Marlins during his rookie campaign, struggling to a 9.82 ERA with 24 strikeouts in 14+2⁄3 innings pitched.

Nardi made 63 appearances out of the bullpen for Miami in 2023, compiling an 8–1 record and 2.67 ERA with 73 strikeouts and 3 saves across 57+1⁄3 innings pitched.