Jeremy Peña Under 1.5 Total Bases: MLB AI Pick for September 16, 2026

Jeremy Peña and the Houston Astros host the Kansas City Royals tonight at Daikin Park, first pitch at 7:10 PM CT, and Rithmm's models are flagging his total bases line as one of the cleaner under reads on the MLB prop board.

The pick is Peña Under 1.5 Total Bases at -129. Win probability sits at 59% with a +6.7% Edge, and the prop is tagged Elite Edge in-app with a recommended green star on the card. The models lean Under at about 59% win chance on the Bet Info stack, so the read lives on the under side of the number rather than a blowout projection. That is still enough separation versus the book-implied price for the under to clear as a real Edge.

What makes this card different is how much shortstop total-bases history stacks under Peña at once. Shortstop total-bases unders in the 57 to 60% win-probability band have gone 64-35 (64.6% win rate, +14.2% ROI across 99 bets), and the recent half of that sample is heating at 15-6. Shortstop total-bases unders priced as favorites are 114-66 (63.3% win rate, +8.9% ROI across 180 bets). Broader shortstop total-bases unders sit 115-69 (62.5% win rate, +7.8% ROI across 184 bets). September total-bases unders are 100-63 (61.3% win rate, +7.8% ROI across 163 bets). Elite Edge total-bases unders are 109-68 (61.6% win rate, +8.3% ROI across 177 bets). Unders in the 5 to 10% Edge band with the Elite Edge tag are 89-55 (61.8% win rate, +9.6% ROI across 144 bets). Peña is sitting on that stack at once: shortstop probability band, favorite pricing, September slate, and the Elite Edge tag.

For a 1.5 total bases under, the path is simple. One single and he is still under. An extra-base hit or a multi-hit night cashes the over. The models lean toward the quieter path, and the samples above are where similar priced unders have paid this season. Shop the number before you lock it. A few cents of juice on a -129 under still matter when you are stacking this as a single or a leg.

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Lock in Peña Under 1.5 Total Bases tonight, size it for the juice, and see what else the models are flagging across the board.