Phillies Lean on Lefty Bats Against Diamondbacks Ace Gallen

Rob Thomson keeps lineup mostly intact for series finale, hoping to capitalize on Gallen's struggles against left-handed hitters.

Apr. 12, 2026 at 2:36pm by

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A fragmented, geometric painting depicting a baseball game in progress, with the players and field broken down into sharp, overlapping shapes and planes in a vibrant color palette, capturing the strategic tension of the matchup between the Phillies and Diamondbacks.A cubist interpretation of the strategic chess match between the Phillies and Diamondbacks, with left-handed hitters looking to crack the code of Arizona's ace Zac Gallen.San Francisco Today

The Philadelphia Phillies are stacking their lineup with left-handed batters for Sunday's series finale against Arizona Diamondbacks ace Zac Gallen. Manager Rob Thomson is keeping most of the lineup the same, with the only change being catcher Rafael Marchan starting in place of JT Realmuto. The Phillies are hoping to take advantage of Gallen's tendency to struggle against lefty hitters, who are batting .338 against him this season.

Why it matters

The Phillies are looking to bounce back after a tough loss to the Diamondbacks on Saturday. Capitalizing on Gallen's weakness against left-handed batters could give them the edge they need to take the series finale and build momentum heading into their next matchup against the Cubs.

The details

Phillies manager Rob Thomson is keeping most of the lineup intact for Sunday's game, with the only change being Rafael Marchan starting at catcher instead of JT Realmuto. The middle of the order features four left-handed hitters in Kyle Schwarber, Bryce Harper, Brandon Marsh, and Bryson Stott. The Phillies are hoping this strategy will pay dividends against Gallen, who has struggled against lefty batters this season, allowing a .338 average and 5 home runs.

  • The Phillies and Diamondbacks will face off on Sunday, April 12, 2026 at 1:35 PM.
  • Zac Gallen's last outing was on Tuesday, April 9, 2026 against the Mets.

The players

Rob Thomson

The manager of the Philadelphia Phillies, who is implementing a left-handed heavy lineup for Sunday's game against the Diamondbacks.

Zac Gallen

The starting pitcher for the Arizona Diamondbacks, who has struggled against left-handed hitters this season.

Rafael Marchan

The Phillies' backup catcher who is starting in place of JT Realmuto for Sunday's game.

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What they’re saying

“While Thomson indicated that he is giving "strong consideration" to moving Adolis García, in the cleanup spot for Sunday's finale against Arizona, he has stacked four left-handed bats in the middle of the order with Kyle Schwarber, Bryce Harper, Brandon Marsh, and Bryson Stott hitting in spots two through five.”

— Mike Gill, Author

What’s next

The Phillies will look to take the series finale against the Diamondbacks and build momentum heading into their next series against the Cubs.

The takeaway

The Phillies are making a strategic move to stack their lineup with left-handed hitters in an effort to capitalize on Zac Gallen's struggles against southpaws this season. This could give them the edge they need to take the series finale and continue their push for the playoffs.