The Nationals will play the Mariners on Thursday, May 29th, 2025. Your timezone's first pitch time is 9:40 pm EDT. Check local listings or your nearest streaming app for coverage.
Learn more about MLB Betting with our handy tutorial and guide. We explain money line, total and run line bets. Plus, a great discussion about exotic bets like MLB Baseball parlays and props.
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Table of Contents
- Matchup Stats
- Captain Shady Lines
- Best Odds
- Interactive Odds Example
- Prop Bets
- Team Futures Odds
- Team Pages
- Team Standings
- Other Games Today
Key Matchup Stats
- SportsBetting3.com Power Rankings - As the 2025 season continues, the Washington Nationals possess a 88.00 SportsBetting3.com power ranking. The Seattle Mariners now have a 93.67 power ranking. Teams with a higher SportsBetting3.com power ranking will typically be moneyline favorites.
- Visiting Washington Nationals - The Washington Nationals head into this matchup with a 11-15 record as a visiting team. This standing ranks them 7th Overall for visiting team wins.
- Home Seattle Mariners - The Seattle Mariners will throw the first pitch possessing a 13-11 home team record. That puts them 7th for home team wins in the Overall MLB standings.
- Runs Scored - Washington Nationals batters have produced 225 runs, ranking them 15th Overall, with the Seattle Mariners ranking 11th (238) for runs scored.
- Runs Allowed - Washington Nationals pitchers and fielders have allowed 273 runs, ranking them 6th Overall for runs allowed. Meanwhile, the Seattle Mariners now rank 16th Overall, allowing 219 runs.
- Team Streaks - The Washington Nationals lost their last game. Their opponent, the Seattle Mariners have lost their last 2 games.
- Team Records - Let's review each team's records. The Washington Nationals have a 24-29 Overall record (11.0 GB National East Division), with the Seattle Mariners notching a 29-23 Overall standing (0.0 GB American West Division).
Captain Shady Lines
A broken compass is right at least twice a day.
Avast ye scallywags! The Nationals be sailin' to Seattle for a showdown...against the Mariners on May 29th. These landlubbers better be ready for a fight!
With a record of 24-29, the Nationals be strugglin' to stay afloat. A win percentage of 0.453? Pathetic! They best shape up or walk the plank.
Don't be fooled by their last 10 games record of 7-3. It be a fluke! The Mariners be waitin' to send 'em back to Davy Jones' locker.
The Mariners be holdin' steady with a record of 29-23. A win percentage of 0.558? Impressive, but they be no match for the Nationals' fury... (The Nationals be lookin' to plunder a win in enemy waters).
Check out this game's prop bets below, bet on MLB baseball at legal US sportsbooks, and review each team's standing at the bottom of the page. Let the battle begin!
Best Nationals at Mariners Odds
| Underdog Washington Nationals | Favorite Seattle Mariners |
|---|---|
| Over | Under |
|---|---|
| Underdog Seattle Mariners | Favorite Washington Nationals |
|---|---|
Matchup Odds FAQs
The Seattle Mariners are the -120 moneyline favorite at BetMGM and the Washington Nationals are the +100 moneyline underdog at BetMGM.
The best over line is 7.5 -115 runs at BetMGM, which means you risk $115 to win $100 betting the over. The best under line is 7.5 -105 runs at BetMGM, and that means you risk $105 to win $100 betting the under.
The Washington Nationals are -1.5 +170 run line favorites at BetMGM, while the Seattle Mariners are +1.5 -210 run line underdogs at BetMGM.
MLB Odds Example
|
Game |
 BetMGMBet |
|---|---|
Nationals
Mariners
5/29/25 9:40pm EDT | +100-120 |
- Washington Nationals bettors risk $100 to win $100 at +100 odds. The implied probability for Washington Nationals is 50%.
- Seattle Mariners bettors risk $100 to win $83.33 at -120 odds. The implied probability for Seattle Mariners is 54.55%.
Washington Nationals at Seattle Mariners Prop Bets
| BetMGM Bet |
|
|---|---|
Nationals
Mariners
First Team to Score
5/29/25 9:40pm EDT | -165+130Bet |
Nationals
Mariners
Tie
1st Inning Winner
5/29/25 9:40pm EDT | +280+340-145Bet |
Nationals
Mariners
Tie
First 3 Innings Winner
5/29/25 9:40pm EDT | +130+160+275Bet |
Nationals
Mariners
To Extra Innings
5/29/25 9:40pm EDT | Yes +725No -1200Bet |
| BetMGM | |
Nationals
Mariners
1st Team to Score Will Win
5/29/25 9:40pm EDT | Yes -250No +190Bet |
Mariners
Total Runs
WAS at SEA 5/29/25 9:40pm EDT | 3.5 o -1303.5 u -102Bet |
Nationals
Total Runs
WAS at SEA 5/29/25 9:40pm EDT | 3.5 o -1253.5 u -105Bet |
Emerson Hancock
Strikeouts Thrown
WAS at SEA 5/29/25 9:40pm EDT | 3.5 o -1453.5 u +110Bet |
| BetMGM | |
MacKenzie Gore
Strikeouts Thrown
WAS at SEA 5/29/25 9:40pm EDT | 7.5 o -1457.5 u +110Bet |
Washington Nationals & Seattle Mariners Futures Odds
Latest World Series odds, if available, for each team. Review odds for other teams and learn how to bet on the tournament. See past Championship results and learn how to bet World Series teasers, props and parlays.
Washington Nationals World Series Odds|
Team | BetMGM |
|---|---|
| Nationals | +50000 Bet |
|
Team | BetMGM |
|---|---|
| Mariners | +3000 Bet |
Washington Nationals & Seattle Mariners Team Pages
Review each team's season win total odds, futures odds, betting bonuses and other valuable information on our exclusive team betting odds pages. Team betting odds and stats update throughout the season:
Team Standings
| Team | W | L | Pct | GB | Home | Away | RS | RA | Diff | Strk | L10 |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Seattle Mariners | 29 | 23 | 0.558 | +5.0 | 13-11 | 16-12 | 238 | 219 | +19 | L2 | 6-4 |
| Washington Nationals | 24 | 29 | 0.453 | +10.5 | 13-14 | 11-15 | 225 | 273 | -48 | L1 | 7-3 |
How to Bet on the Game
Time needed: 4 minutes.
How to Bet on the Washington Nationals vs Seattle Mariners MLB Game
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Open a new sports betting account before game time.
Review our list of sports betting sites. Open a new account before the game starts on Thursday, May 29th, 2025 at 9:40 pm EDT, making sure to enter all your personal details correctly. Don't forget to add your bonus code.
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Visit the sportsbook’s cashier, banking, or deposit page.
Navigate to the sportsbook's deposit page. Use your Visa card or MasterCard, or deposit with a bank transfer, or other methods like Paypal.
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Tap to the sportsbook's MLB page, look for the Washington Nationals vs Seattle Mariners Game.
Navigate to the sportsbook's MLB page. Next, look for live or upcoming matchups. Select the Washington Nationals vs Seattle Mariners Game.
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Choose your bet and place a wager.
Choose your bet and then use the funds you deposited to place a wager. The sportsbook will pay your winnings or deduct a losing wager from your account balance after the game.
Other May 29, 2025 MLB Games
- Atlanta Braves vs Philadelphia Phillies - 5/29/25 1:05pm EDT
- Atlanta Braves vs Philadelphia Phillies - 5/29/25 6:45pm EDT
- Oakland Athletics vs Toronto Blue Jays - 5/29/25 7:07pm EDT
- Tampa Bay Rays vs Houston Astros - 5/29/25 8:10pm EDT