The Boston Red Sox return to Fenway Park on Monday, August 17, 2026, to host the Arizona Diamondbacks in a regular season interleague matchup. First pitch is scheduled for 7:10 PM ET, with the game airing on NESN locally and DBACKS.TV for Arizona viewers. The Diamondbacks come to Boston with left-hander Mitch Bratt confirmed as their probable starter. The Red Sox have not yet announced a starting pitcher for this one, adding an early layer of intrigue to a Monday night contest under the Fenway lights.
Starting Pitchers: Mitch Bratt Takes the Ball for Arizona
The Diamondbacks are rolling with Mitch Bratt, who gets the call against Boston. Bratt is a young arm whose specific 2026 numbers are not yet available heading into this preview, but his presence in the rotation signals that Arizona is invested in developing its pitching depth. The Sox have not named a starter opposite him, which means Boston could be looking at a bullpen game or a late roster decision before Monday's first pitch. Either way, it puts pressure on the Red Sox offense to do damage early and often against a starter the Fenway crowd will not know all that well.
Keys to Watch in Monday Night's Game
- Boston's unnamed starter situation: Until the Red Sox name a pitcher, lineup construction and early-inning strategy remain question marks. Watch for a pregame announcement that could shape how both benches approach the first three innings.
- How Bratt handles Fenway's atmosphere: Pitching at Fenway for the first time is its own challenge. The dimensions, the crowd, and the Wall in left field demand adjustments. Young starters can be rattled or can rise to the occasion — Monday will tell us something about where Bratt stands.
- Boston's lineup against a less-familiar arm: Facing a pitcher with limited big-league exposure can cut both ways. The Sox hitters may not have a deep book on Bratt, but a quality lineup that stays disciplined at the plate and works counts should be able to create damage.
- Bullpen depth for both sides: With Boston's starter unannounced, the Red Sox bullpen could factor in heavily. Arizona's relief corps will also be worth monitoring if Bratt runs into trouble in the middle innings.
Prediction
Fenway on a Monday night in August is exactly when this team needs to take care of business at home. The pitching uncertainty on Boston's side is real, but familiarity with the ballpark and home-field energy give the Red Sox the edge here. Without confirmed numbers for either starter, this comes down to which offense can impose its will first. Expect a competitive, back-and-forth game that leans Boston's way in the late innings. Red Sox win, 5-3.
