MIAMI — White Sox center fielder Luisangel Acuna is learning his position on the job, and the growing pains showed in an ugly defensive inning that cost his team mightily en route to a 9-2 loss to the Marlins.

The Sox peppered Miami starter Janson Junk for four singles in the third, with RBIs from Munetaka Murakami — who has started his career on a five-game hitting streak — and Andrew Benintendi.

Munetaka Murakami has recorded a hit in each of his first five career games! pic.twitter.com/5aGmiunXlF

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Erick Fedde’s return to the Sox rotation was near-flawless until the fourth inning, when Marlins second baseman Xavier Edwards singled and Agustín Ramírez sent a rocket to the right field gap for a double that almost resulted in a full-speed collision between Acuna and Tristan Peters.

A diving Murakami couldn’t stop a scorching Liam Hicks liner down the first base line for a two-run double.

Then former Cub Owen Caissie knocked in another, advanced on a throwing error by Acuna and came home on a single from Heriberto Hernandez. Acuna, the Sox’ main trade return and replacement for Luis Robert Jr., made another ill-advised throw on that play.

The Marlins tagged reliever Bryan Hudson for two more in the seventh, one on a fielding error charged to catcher Edgar Quero on a sacrifice bunt, and they piled the rest on Rule 5 rookie Jedixson Paez.

In his first start with the Sox since coming back to the Sox on a one-year deal, Fedde lasted five innings, giving up six hits and three earned runs with a walk and four strikeouts.

Ben there

Benintendi thought he’d be playing in a winning clubhouse a lot sooner when he signed the biggest contract in Sox history in 2023.

The Sox thought they’d be getting more from the former All-Star and Gold Glover, whose limited range after two years of Achilles issues was exposed during a tough opening series at Milwaukee.

Barring a trade — unlikely given the $30 million-plus remaining he’s still owed