He was selected by the Giants in the fourth round of the 2019 Major League Baseball draft.

[11][12][13] Fitzgerald was selected by the San Francisco Giants in the fourth round of the 2019 Major League Baseball draft.

[15][16] In 2019, Fitzgerald spent his first professional season with the Arizona League Giants, Salem-Keizer Volcanoes, and Augusta GreenJackets, batting .276/.359/.395 with one home run, six stolen bases in seven attempts, and 30 RBIs over 48 games.

He played the 2021 season with the Eugene Emeralds, tied for the league lead with 28 doubles and 139 strikeouts and slashing .262/.342/.495 with 71 runs (2nd in the league), 19 home runs (2nd), and 65 RBIs (3rd) in 382 at-bats over 103 games, playing shortstop exclusively.

[26] Fitzgerald's father, Mike, was drafted in the first round in the 1984 MLB draft by the St. Louis Cardinals and played 13 games in the majors as a first baseman; in the minors, in 1987 he led the Texas League with 108 RBIs, as he was fourth in the league in home runs with 27.