The Phillies started Max Kepler in right field tonight against Marlins righty Valente Bellozo. That left Nick Castellanos on the bench for the third time in the past four games, all of which came with a right-hander on the mound.

Manager Rob Thomson said Thursday that Kepler would pick up increased playing time against righties (link via Charlotte Varnes of The Athletic). “At this point in the year, I’m going to put out what I think is the best lineup on any given day to win a ballgame,” Thomson said. “There’s still a bit of a rotation, if you want to call it that. If you want to call it a platoon, doesn’t matter to me.”

That won’t leave much playing time for the righty-hitting Castellanos. That’s less about handedness and more a reflection of his numbers in the second half. Castellanos carries a .199/.253/.309 batting line since the All-Star Break. He had a sub-.600 OPS in both July and August. Kepler’s season numbers are poor, but he’s been the much better hitter in recent weeks. The lefty batter owns a .267/.318/.483 slash with a dramatically reduced 12.1% strikeout rate since the beginning of August. That doesn’t include tonight’s performance, in which he chipped in another two knocks and a home run.

The Phils haven’t wanted to give Kepler playing time against left-handed pitching all season. He’s hitting .196/.258/.304 without the platoon advantage. Castellanos will continue to get at-bats against southpaws. The outfield against righty pitching will run Brandon Marsh, Harrison Bader and Kepler from left to right. Castellanos obviously isn’t going to take more than a scattered start at DH or first base from Kyle Schwarber or Bryce Harper. He’ll be relegated to a short-side platoon role barring an injury.

Castellanos is in the fourth season of a five-year deal that pays him $20MM annually. The Phils signed Castellanos and Schwarber within days of one another coming out of the 2022 lockout. The Schwarber contract has been one of the best free agent pickups in recent memory. The Castellanos addition hasn’t worked out nearly as well. He’s been exceptionally durable and racked up counting stats (including a 29-homer season with 106 RBI in 2023). His rate metrics at the plate have been essentially league average, though, and he’s one of the league’s worst defensive outfielders. FanGraphs and Baseball Reference have each valued Castellanos around a cumulative one win above replacement over the past four seasons.

Schwarber, Bader and Kepler are each impending free agents. The Phils could turn left field to former first-round pick Justin Crawford in 2026. It’s tough to imagine they’ll roll with Castellanos as an everyday right fielder next season. They’re going to make an effort to bring Schwarber back at designated hitter. It stands to reason they’ll try to find a trade partner willing to assume a small portion of Castellanos’ salary, but his second-half numbers could leave them weighing an offseason release if they don’t find a taker.