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Early Preview Lineups: Projected Odds Posted 7 min read

Washington Nationals vs San Diego Padres Preview

WSH at SD 2026-09-08 preview: probable pitchers, projected lineups, NRFI/F5 model picks, weather, ballpark, and umpire context.

Washington Nationals at San Diego Padres MLB game preview for September 8, 2026
WSH
Washington Nationals
Riley Cornelio RHP
@
9:40 PM ET
Petco Park
SD
San Diego Padres
Casey Mize RHP
Last updated Tuesday, September 8, 2026
Final This game has finished. Read the recap for final score, model grades, and box score.

Key Facts

Matchup
Washington Nationals at San Diego Padres
Date
Tuesday, September 8, 2026
First Pitch
9:40 PM ET
Venue
Petco Park
Probable Starters
Riley Cornelio (RHP) vs Casey Mize (RHP)
Lineups
Projected
Odds Snapshot
Sep 8, 9:41 PM ET
Last Updated
Sep 8, 7:30 AM ET

Betting Board

Snapshot Sep 8, 9:41 PM ET
Moneyline
WSH +165
SD -180
Total
Over 7.5 -124
Under 7.5 +102
Run Line
WSH +1.5 -137
SD -1.5 +114

Model Angles

NRFI Model
NRFI · 59%
+3.5% edge
Projected Total
5.2
model combined runs
Park Factor
0.96
Neutral · HR 0.92
First Pitch Weather
88°F
12.7 mph NNW
The Nationals travel to Petco Park for a Wednesday night test against the Padres, and the pitching matchup tilts sharply in San Diego's favor. Casey Mize takes the ball with a 3.64 ERA and 1.12 WHIP, numbers that contrast starkly with Riley Cornelio's 5.96 ERA and 1.81 WHIP. The model projects 5.2 combined runs, splitting 2.8 for Washington and 2.5 for San Diego. That's a pitcher-friendly environment in a park carrying a 0.96 runs factor, and the forecast calls for 91 degrees with a 9 mph wind out of the north. Mize has been especially effective in the first inning. He carries a 77 percent NRFI rate across 22 games in that sample, and the NRFI model assigns a 57 percent probability tonight with a 1.8 percent edge. Petco trends lean the same way. The last ten games at the park have seen NRFI cash 80 percent of the time, even as the average total has climbed to 9.1 runs. That divergence suggests early quiet followed by late offense, a pattern that fits Mize's profile. Cornelio is the wildcard. His strikeout rate sits at 9.13 per nine, but the K model projects him for just 1.5 tonight against a line of 4.0. That's a lean Under with six-out-of-ten confidence. Mize's projection is 2.9 strikeouts against a 4.5 line, also an Under lean but at five-out-of-ten confidence. Neither pitcher profiles as a high-volume punchout arm in this spot. Washington enters at 67-79 and riding a five-game losing streak. San Diego sits at 76-68 with a two-game winning streak. The Padres' bullpen fatigue registers at 100 out of 100, fully rested. Washington's pen checks in at 58 out of 100, moderately taxed. CJ Abrams leads the Nationals' barrel rate at 14.9 percent, just ahead of James Wood's 13.7 percent. Daylen Lile sits at 9.7 percent. Neither offense projects for much volume tonight.
  • Mize carries 77 percent NRFI rate across 22 first-inning games
  • Cornelio projected 1.5 strikeouts against 4.0 line, lean Under
  • NRFI model shows 57 percent probability with 1.8 percent edge

Pitching Matchup

WSH Away
Riley Cornelio
RHP · 2-2 · 0 GS
ERA
5.96
WHIP
1.81
K/9
9.13
IP
22.2
Career: 5.96 ERA · 1.81 WHIP · 9.13 K/9
SD Home
Casey Mize
RHP · 5-9 · 22 GS
ERA
3.64
WHIP
1.12
K/9
7.92
IP
113.2
Career: 4.08 ERA · 1.25 WHIP · 7.56 K/9
NRFI: 83.9%
1st Inn ERA: 1.88

On the season, Casey Mize holds the ERA edge in this matchup. Riley Cornelio carries a 5.96 ERA and 1.81 WHIP, while Casey Mize sits at 3.64 ERA and 1.12 WHIP.
Strikeout rates: Riley Cornelio at 9.13 K/9, Casey Mize at 7.92 K/9.
K projections: Riley Cornelio at 1.5 (line 4.0)
Casey Mize projected at 2.9 (line 4.5).
Casey Mize has a 83.9% career NRFI rate. No first-inning data available for Riley Cornelio.
Both starters throw from the R side, limiting platoon splits for either lineup.

Strikeout Projections

Riley Cornelio vs SD
Proj: 1.5Line: 4.0
-2.5
Confidence:
Casey Mize vs WSH
Proj: 2.9Line: 4.5
-1.6
Confidence:
View all K projections on SlateIQ

Our strikeout model weighs pitcher K rate, opponent lineup whiff tendency, park factors, and umpire zone size to project total strikeouts per starter.

Riley Cornelio (Washington Nationals) is projected for 1.5 strikeouts against a posted line of 4.0. The projection sits 2.5 K below the line, giving the model an Under lean.
He faces a moderate-K lineup that strikes out at 22.3% with a 28.0% whiff rate.

Casey Mize (San Diego Padres) is projected for 2.9 strikeouts against a posted line of 4.5. The projection sits 1.6 K below the line, giving the model an Under lean.
He faces a moderate-K lineup that strikes out at 23.6% with a 28.0% whiff rate.

The Washington Nationals lineup is more vulnerable to strikeouts in this matchup. San Diego Padres batters K at 22.3%, Washington Nationals batters at 23.6%.

NRFI & First 5 Analysis

NRFI Model
58.9%
probability of NRFI
+3.5%
market edge
Monitor
Market implied: 55.4%Model: 58.9%
First 5 Innings
2.9est. F5 runs
WSH
5.96 ERA
SD
3.64 ERA
5.1 inn/start
F5 lean: Strong SD
WSH K Projection
Riley Cornelio
1.5proj
Line: 4.0
-2.5 UNDER
Confidence
SD K Projection
Casey Mize
2.9proj
Line: 4.5
-1.6 UNDER
Confidence
Explore all model projections

Our NRFI model analyzes both starting pitchers' first-inning profiles, the top-of-order hitters in each lineup, the umpire's historical zone, and environmental factors to produce a probability estimate. For this game, the model assigns a 58.9% probability of no runs in the first inning, compared to the market's implied probability of 55.4%.

  • That creates a slim 3.5% edge on NRFI.
  • The best available line is NRFI -124 / YRFI +102 at FanDuel.
  • Home plate umpire Doug Eddings runs a wide zone. See the umpire section below for full career data.
  • Our NRFI model sits at 148-132 (52.9%) on official picks this season.

Prop Edges

2 model signals detected
Riley Cornelio
Strikeouts Under 4.0
Casey Mize
Strikeouts Under 4.5
See all today's picks and edges

Lineup & Matchup Breakdown

Washington Nationals Projected
K%: 23.6
1James WoodLRF
2CJ AbramsLSS
3Daylen LileLLF
Whiff rate: 28.0%Team page
San Diego Padres Projected
K%: 22.3
Whiff rate: 28.0%Team page
Batter vs Pitcher matchup tool

Lineups are projected as of this writing.

Washington Nationals K vulnerability: 23.6% strikeout rate, 28.0% whiff rate.

San Diego Padres K vulnerability: 22.3% strikeout rate, 28.0% whiff rate.

Ballpark, Weather & Umpire

Petco Park
Run Factor0.96
HR Factor0.92
Full park profile
Home Plate Umpire
Doug Eddings
Slightly tight NRFI: 57.1% 7 games
Full umpire profile
Hourly Game Forecast
88°
9 PM
13 mph
NNW
87°
10 PM
11 mph
N
87°
11 PM
9 mph
N
86°
12 AM
5 mph
N
  • Petco Park carries a 0.96 run factor (neutral).
  • Home run factor: 0.92 — the park suppresses HR power.
  • Park notes: Cool San Diego weather; Low humidity suppresses HRs; Shallow right field.
  • First pitch forecast: 88F with 13 mph winds from the NNW. Humidity: 50%.
  • Wind advisory: 13 mph winds from the NNW may impact fly balls.
  • Home plate umpire: Doug Eddings.
  • Career NRFI rate: 57.1% across 7 games tracked.
  • Zone tendency: Slightly tight.
  • K factor: 0.929 (below average strikeouts in his games).

Run Projections & Total

  • Our projection model puts the total at 5.2 combined runs, with Washington Nationals projected for 2.8 and San Diego Padres for 2.5.
  • That's 2.3 runs below the posted total of 7.5, suggesting a lean toward the Under.
  • The run projection is essentially a coin flip between these two teams.
The Bottom Line
The NRFI is the clearest angle. Mize's 77 percent first-inning success rate and the 1.8 percent model edge align with Petco's recent 80 percent NRFI trend over the last ten games. Cornelio's volatility is the risk. His 5.96 ERA and 1.81 WHIP suggest early trouble is possible, even in a pitcher's park. The strikeout Unders carry less conviction, especially Cornelio's 1.5 projection at six-out-of-ten confidence. Mize's Under sits at five-out-of-ten, barely a lean. The total projects low at 5.2, but the Padres' fully rested bullpen and Washington's five-game losing streak tilt late-game context toward San Diego if the game stays close.
This preview is generated from thecapper.io projection models and publicly available data. All projections are model estimates, not guarantees. Gamble responsibly. If you or someone you know has a gambling problem, call 1-800-GAMBLER.