MLB Preview · September 18, 2026

New York Yankees at Arizona Diamondbacks: Prediction, Odds & Preview

NYY 57-45at AZ 54-49·Chase Field·

DiamondIQ Model — Win Probability

NYY49.3%50.7%AZ

The model leans AZ (50.7%). DiamondIQ model v2: season records, home-field advantage, the starting-pitcher quality gap (PitchIQ), and a calibration adjustment fit and validated on four seasons of backtest — plus live game state once underway.

The Matchup

The New York Yankees (57-45) travel to Chase Field to face the Arizona Diamondbacks (53-49) in what the DiamondIQ model's estimate frames as an almost perfectly balanced contest. The model gives Arizona a razor-thin 50.5% win probability against New York's 49.5%, a margin that reflects the D-backs' home-field advantage at a venue carrying a park factor of 1.03 — a mild but real boost to the run environment relative to league average. The Yankees hold the superior record by four games, but the Diamondbacks' familiarity with Chase Field's conditions pulls the ledger nearly even. With probable starters not yet announced on either side, this early look cannot account for what will almost certainly be the single largest swing factor once rotations are set, so treat the model's read as a baseline that will shift meaningfully when pitching assignments are confirmed.

The injury landscape is worth monitoring carefully on both sides before that rotation picture develops. New York is carrying significant absences, including Aaron Judge on the 60-day IL, Giancarlo Stanton sidelined on the 10-day, and both Carlos Rodón and Clarke Schmidt unavailable from the rotation. Arizona's own IL is crowded in the outfield, with Jordan Lawlar, Lourdes Gurriel Jr., and Tommy Troy all on 10-day stints, though the D-backs' pitching depth concerns are somewhat mitigated by the starters-TBD nature of the preview. Bullpen availability is similarly compressed on both sides: Arizona's BullpenIQ sits at 60 out of 100 with six arms carrying heavy workloads and closer Paul Sewald available, while New York grades at 59 out of 100 with four heavy-use arms and closer David Bednar in reserve.

The one condition demanding attention in this preview is the forecast temperature of 117 degrees Fahrenheit at first pitch. Chase Field is a retractable-roof stadium, and management of that environment — whether the roof is open or closed — could have a meaningful effect on how the ball carries and how pitcher workloads are managed deep into the game. The model leans toward Arizona, but given the near-perfect split in win probability and the number of open variables including starters, lineup construction around the injuries, and the roof decision, this matchup will sharpen considerably as game time approaches and confirmed information fills those gaps.

Analysis generated by DiamondIQ's model.

Forecast at First Pitch

☀️108°FClear
Wind 10 mph WNW · L→R
Precip 5%

Injured List

NYY
Giancarlo Stanton (DH)Injured 10-Day
Carlos Rodón (P)Injured 15-Day
Aaron Judge (RF)Injured 60-Day
Clarke Schmidt (P)Injured 60-Day
AZ
Jordan Lawlar (LF)Injured 10-Day
Lourdes Gurriel Jr. (LF)Injured 10-Day
Tommy Troy (LF)Injured 10-Day
Drey Jameson (P)Injured 15-Day
Michael Soroka (P)Injured 15-Day
Zac Gallen (P)Injured 15-Day
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