The Washington Nationals head to Petco Park for a 9:40 PM ET first pitch on Tuesday, September 8, squaring off against the San Diego Padres in a late-night West Coast showdown. Riley Cornelio gets the ball for Washington against Padres right-hander Casey Mize. With the regular season winding down and every game carrying roster-evaluation weight for a rebuilding club, this trip to San Diego is a chance for the Nationals to show what the next wave of young talent can do against a legitimate National League contender.
Nationals at Padres: Tuesday, September 8, 2026 Game Preview
Starting Pitchers: Cornelio vs. Mize
Riley Cornelio draws the start for Washington, and this is one of those appearances that matters beyond the box score. The young right-hander has an opportunity to build on his development arc and prove he belongs in a late-season big-league rotation. Every start down the stretch gives the Nationals' front office more information heading into the offseason, and Cornelio's command and ability to work through a lineup multiple times will be under the microscope.
On the other side, Casey Mize takes the hill for San Diego. Mize has the profile of a pitcher who can stifle lineups when he's on — his repertoire keeps hitters off balance, and pitching at Petco Park, one of the more pitcher-friendly environments in the National League, only helps. Washington's lineup will need to be disciplined early and not let Mize work into a comfortable rhythm.
Keys to Watch for Washington
- Cornelio's pitch efficiency: Getting deep enough into the game to preserve a taxed bullpen is essential. If Cornelio can navigate five or six innings, Washington avoids burning late-inning arms unnecessarily in a road game with a late start.
- Plate discipline against Mize: Mize rewards patient hitters who work counts. Washington needs to make him throw strikes and avoid chasing early in at-bats, particularly with runners on base.
- Bullpen management: A 9:40 PM ET start on the West Coast means this game could run well past midnight Eastern. Manager decisions in the sixth and seventh innings will be critical if the Nationals find themselves in a close game.
- Capitalizing on Petco Park dimensions: The park suppresses home runs, so Washington needs to manufacture runs through contact, baserunning, and situational hitting rather than waiting for a big fly.
Broadcast Information
Nationals fans can catch the game on Nationals.TV or listen along on WJFK 106.7 The Fan. Spanish-language coverage is available on XEMO 860 AM.
Prediction
This is a tough road ask. The Padres are playing meaningful September baseball, Petco Park is a difficult environment for opposing offenses, and Mize is a capable arm who will keep Washington off the board if the Nationals aren't sharp. Cornelio's ability to keep San Diego's lineup in check will determine whether the Nationals have any shot at stealing this one. Expect a low-scoring game — the Padres pull it out, 4-2, but Cornelio gives Washington a competitive enough outing to call it a developmental win worth building on.
