MLB Preview · August 18, 2026

San Diego Padres at New York Mets: Prediction, Odds & Preview

SD 48-50at NYM 41-58·Citi Field·

DiamondIQ Model — Win Probability

SD51.4%48.6%NYM

The model leans SD (51.4%). 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 San Diego Padres bring a .500 record into Citi Field to face a Mets club that has been one of the more disappointing teams in the National League, sitting 16 games below .500 at 41-57. With probable starters not yet named for this August 18 matchup, this is an early look at what shapes up as a meaningful late-summer contest between a Padres team trying to hold its footing in the playoff picture and a Mets team looking to avoid further separation from the field. The DiamondIQ model's estimate currently gives San Diego a 51.7 percent win probability against New York's 48.3 percent, a lean that reflects the Padres' record advantage while acknowledging that home field at Citi Field keeps the Mets within striking distance.

Because starters have not been announced, the pitching piece of this preview will sharpen considerably as the week progresses and probable arms are named. What can be said now is that the DiamondIQ model's v2 framework incorporates a PitchIQ-based starting-pitcher quality gap in arriving at that slim San Diego edge, so the eventual pitching assignments carry real weight in whether that lean holds or shifts. On the relief side, San Diego's bullpen enters with a BullpenIQ of 56 out of 100 but carries significant fatigue, logging five heavy-use arms over the last three games against just one fresh option, with closer Mason Miller available. New York's bullpen grades slightly lower at 52, though it arrives with four fresh arms and three heavy, with one arm likely unavailable and Devin Williams as the closer, though the Mets' 60-day IL includes both Clay Holmes and Dedniel Nunez.

Conditions at first pitch project to be favorable for play, with clear skies, 77 degrees, and a 12 mph SSE wind blowing out toward center field — a detail worth monitoring as lineups are set, since any carry to straightaway center could marginally benefit power hitters on both sides. The thing to watch as this preview matures into game day is straightforward: whoever the Padres send to the mound against a Mets rotation still absorbing significant injury attrition will go a long way toward determining whether San Diego's model-favored edge expands or effectively disappears.

Analysis generated by DiamondIQ's model.

Forecast at First Pitch

☁️78°FOvercast
Wind 14 mph SE · R→L
Precip 70%

Injured List

SD
Samad Taylor (LF)Injured 10-Day
David Morgan (P)Injured 15-Day
Jason Adam (P)Injured 15-Day
Jeremiah Estrada (P)Injured 15-Day
Lucas Giolito (P)Injured 15-Day
Randy Vásquez (P)Injured 15-Day
NYM
Mark Vientos (1B)Injured 10-Day
Austin Warren (P)Injured 15-Day
Clay Holmes (P)Injured 60-Day
Dedniel Núñez (P)Injured 60-Day
Justin Hagenman (P)Injured 60-Day
Luis Robert Jr. (CF)Injured 60-Day
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