J.T. Realmuto’s offensive numbers were down in 2025, but a deeper look into his splits tell a more complete story about his season at the plate.

Most of Realmuto’s production in 2025 comes from two hot months in the summer, when the catcher posted an .881 and .763 OPS respectively in July and August. A poor September, however, led to him finishing the second half with a .691 OPS, lower than his .705 OPS in the first half.

Prior to 2025, Realmuto did not have drastic platoon splits. From 2019 to 2024, Realmuto had a .793 OPS against right-handed pitching and an .820 OPS against left-handed pitching. That changed in 2025.

In the first half of 2025, Realmuto struggled terribly against lefties. In 89 at-bats against southpaws in the first half, Realmuto had only five extra-base hits, all doubles. He slashed .146/.191/.202 against lefties in that span. At the same time, Realmuto had a solid .319/.378/.457 slash line against righties.

Realmuto in the first half was the Phillies’ worst hitter against left-handed pitching. Bryson Stott, Brandon Marsh and Max Kepler, all left-handed hitters whose looks against lefties were limited by manager Rob Thomson, had better first half numbers than Realmuto against lefties.

Why did a platoon advantage become a platoon disadvantage? Realmuto at the time attributed those numbers to poor luck. That somewhat checks out because his platoon splits evened out in the second half.

After the All-Star break, his numbers took another turn. He slashed .303/.361/.515 against lefties, but only .212/.275/.328 against righties.

It will be a hard for a player like Realmuto to be as bad again against left-handed pitching as he was in the first half of 2025. It’s still encouraging, however, that his numbers against righties at the time were good enough to prevent his season numbers from completely collapsing.

With those splits in mind, should potential suitors be bullish on Realmuto as an offensive player? He is no longer the aircraft carrier he once was as recently as 2022, when his second-half surge at the plate led to MVP consideration. But he’s not the No. 9-hitting catcher that’s only in the lineup for his abilities behind the plate.

His days as a 20-home run hitter are likely gone, but he still has gap-to-gap power. His 26 doubles in 2025 are in line with his totals from 2021 to 2023.

One of the bigger red flags is his declining bat speed. From 2024 to 2025, Realmuto’s average bat speed declined from 73.2 mph to 72 mph. His 1.2 mph decline is the 12th largest among major league hitters, according to Statcast. Nick Castellanos is slightly ahead of him. His average bat speed declined from 71.9 mph in 2024 to 70.5 mph in 2025.

Teams in the Realmuto market are interested in acquiring a skill set that’s impossible to quantify with numbers alone. Pitchers value his pitch-calling abilities and feel for in-game adjustments. The Phillies see enough value in that to make re-signing Realmuto an offseason priority, despite some regression on the offensive side.