The Washington Nationals open a three-game set at Comerica Park on Monday night, and both starters are coming back from Tommy John surgery. DJ Herz makes his first big-league start since September 2024. River Ryan makes his Detroit Tigers debut after arriving in the Tarik Skubal trade. Detroit is a -153 favorite, and 74% of run line bets are on the home side. However, the moneyline has drifted slightly toward Washington since the open. Our headline play leans into that tension.
Last Updated: Monday, September 21, 2026
Washington Nationals vs. Detroit Tigers — Time & How to Watch
| Where | Comerica Park, Detroit, MI |
| When | Monday, September 21, 2026 – 6:40 PM ET |
| TV | Nationals.TV, Detroit SportsNet |
Washington Nationals vs. Detroit Tigers Betting Preview
Herz was a legitimate strikeout arm as a rookie. He posted a 4.16 ERA over 19 starts in 2024, with 106 strikeouts in 88 2/3 innings. A UCL injury in spring 2025 led to Tommy John surgery, and a flexor strain slowed his rehab this year. Herz reached 65 pitches in his final Triple-A outing, so roughly four innings is a realistic ceiling on Monday.
Ryan’s workload will be even lighter. The right-hander posted a 1.33 ERA across four starts with the Dodgers in 2024 before needing his own elbow surgery. He then missed all of 2025. Manager A.J. Hinch said Ryan will work a shorter outing than a normal start, with Keider Montero pitching behind him. Montero carries a sub-3.60 ERA across more than 145 innings this season. Still, he allowed eight earned runs over eight innings in his Sept. 4 and Sept. 9 starts.
Both clubs enter at 73-83 and are out of the postseason race. Detroit sits eight games behind first-place Cleveland in the AL Central. Washington is fourth in the NL East, 19 games back. The profiles differ sharply. Washington ranks third in MLB with 798 runs and fifth with 203 home runs. CJ Abrams (31 homers) and James Wood (30) drive that lineup. Detroit has scored 697 runs but allowed only 629, a +68 run differential its record doesn’t reflect.
The Tigers’ bats went cold in Chicago. Detroit dropped three of four to the White Sox and scored exactly one run in each loss, including Sunday’s 8-1 defeat. (Here is our Tigers-White Sox series finale preview.) Washington won six of seven before a 5-3 loss in St. Louis on Sunday, covered in our Nationals-Cardinals preview.
Washington Nationals vs. Detroit Tigers Odds
| Run Line | Moneyline | Total | |
|---|---|---|---|
| Nationals | +1.5 (-165) | +128 | U 8 (+100) |
| Tigers | -1.5 (+140) | -153 | O 8 (-120) |
Odds accurate as of Monday, September 21, 2026 via TheSpread.com. Odds change, get the latest MLB Odds – Futures – Props
Washington Nationals vs. Detroit Tigers — Who Is the Public Betting?
| Nationals | 26% | 74% | Tigers |
See the latest MLB Public Betting Splits and make smarter wagers!
Nationals vs. Tigers Prediction — Is the Home Chalk Too Expensive?
The market is sending a quiet signal here. Roughly three of every four run line tickets are on Detroit, and the moneyline split is similar. Yet the Tigers opened at -158 and have slipped to -153, while Washington shortened from +132 to +128. That small move runs against heavy public support. At -153, Detroit also needs to win about 60.5% of the time just to break even.
The baseball case starts with Detroit’s lineup. The Tigers scored one run in three of their last four games and rank 19th in home runs. Ryan and Montero will then have to navigate a Washington order that ranks third in runs. Neither starter projects to pitch deep. A one-run game or an outright Nationals win both look realistic. The 1.5-run cushion covers both outcomes.
The case against is Washington’s bullpen. The Nationals set a single-season record for blown saves earlier this month. With Herz capped near 65 pitches, that relief corps may need to cover five innings. If Detroit’s hitters finally wake up late, a multi-run margin is very possible. The cushion also costs real juice. Still, the market read and the Tigers’ cold offense point the same direction.
The Pick: Nationals Run Line +1.5 (-165)
Nationals vs. Tigers Prediction — Will Detroit’s Cold Bats Keep This Quiet?
This total has already moved. It opened at 8.5 and now sits at 8, even with the under priced at even money. That drop lines up with Detroit’s recent offense. The Tigers have produced one run in three of their last four games. Their pitching has kept them competitive all season, allowing just 629 runs. Ryan was also sharp in his brief 2024 run.
The Nationals are the clear risk, however. They have scored 798 runs, and their shaky pitching has turned plenty of their games into slugfests. Montero’s recent form adds more concern, and Washington’s relievers could leak runs in the late innings. An early crooked number could push this over quickly. This is a lean rather than a strong play. Still, the plus-money price and the downward market move make it the better side of the number.
The Pick: Under 8 (+100)
Final Thoughts and Bonus Angle
No third angle stands out enough to add a bonus play. Instead, watch three swing points. First, track Herz’s pitch count, because an efficient four innings shrinks Washington’s bullpen exposure. Second, watch the handoff from Ryan to Montero, who has not looked sharp lately. Third, watch Detroit’s bats late, since Washington’s relievers have given away leads all season.
Here is a summary of our picks for Monday’s series opener:
- Nationals Run Line +1.5 (-165)
- Under 8 (+100)
MLB Nationals vs. Tigers FAQ: Monday September 21, 2026
What time does the Nationals vs. Tigers game start?
The Nationals vs. Tigers game starts at 6:40 PM ET on Monday, September 21, 2026. First pitch is scheduled at Comerica Park in Detroit, Michigan. The game opens a three-game series, with Washington arriving from St. Louis and Detroit returning home from a four-game set in Chicago.
What channel is the Nationals vs. Tigers game on?
The Nationals vs. Tigers game airs on Detroit SportsNet in the Tigers’ home market and on Nationals.TV in the Washington market. Both are the teams’ regional broadcast outlets for Monday’s game. Tigers radio coverage is available on 97.1 The Ticket in Detroit.
Who is pitching for the Tigers tonight?
River Ryan is the Tigers’ scheduled starter on Monday, making his Detroit debut. The right-hander came over from the Dodgers in the Tarik Skubal trade and has not pitched in the majors since 2024 because of Tommy John surgery. Detroit plans a short outing for him, with Keider Montero expected to pitch behind him.
Who is pitching for the Nationals tonight?
DJ Herz is the Nationals’ scheduled starter on Monday, returning from the 60-day injured list. The left-hander has not pitched in the majors since September 2024 after undergoing Tommy John surgery. As a rookie in 2024, he posted a 4.16 ERA across 19 starts with 106 strikeouts in 88 2/3 innings.
How many games are left in the Nationals-Tigers series?
Monday’s game is the first of three between the Nationals and Tigers at Comerica Park. The series continues Tuesday, September 22, at 6:40 PM ET and wraps up with a Wednesday afternoon game on September 23 at 1:10 PM ET. Both teams entered the series with identical 73-83 records.