The 24-year-old Serna will hit the big leagues for the first time and will provide the Marlins with some added depth in the middle infield after second baseman Xavier Edwards (thumb) was placed on the injured list. Over 337 plate appearances with Jacksonville on the season, Serna slashed .218/.300/.364 with 11 home runs and 14 stolen bases.

The 23-year-old played in four Grapefruit League games and went 3-for-11 with a double and a home run, but he'll now make his way to minor-league camp. Serna had a .578 OPS in 101 games with Double-A Pensacola in 2025 before joining Jacksonville for a cup of coffee late in the season. He'll need to improve at the plate to have a chance of making his MLB debut anytime soon.