Antonini begins his first season with the Ducks and fifth in professional baseball. The catcher comes to Long Island after playing four seasons in the St. Louis Cardinals organization. In 193 games, he posted a .334 on-base percentage with 24 home runs, 101 RBIs, 87 runs, 127 hits, 21 doubles, two triples and 86 walks. The 25-year-old was also outstanding behind the plate, compiling a .988 fielding percentage while throwing out 42 percent of runners attempting to steal.

The Tennessee resident split time in 2023 with Double-A Springfield and Triple-A Memphis. He combined to accrue a .352 on-base percentage and a .786 OPS along with six homers, 34 RBIs, 18 runs, 33 hits, six doubles, one triple and 14 walks over 41 games. In 2022, he combined to throw out a career-best 49 percent of runners attempting to steal with High-A Peoria and Double-A Springfield. Antonini was originally selected by the Cardinals in the 18th round of the 2019 amateur draft.