Mariners vs. Mets Predictions, Odds & Expert Picks for Sunday Night Baseball

We're backing the Seattle Mariners to win Sunday Night Baseball while fading a New York Mets' slugger.

Mike Spector

Last Updated: August 17, 2025 2:58 PM EDT • 3 minute read

The series finale between the Seattle Mariners and New York Mets heads to Williamsport, Pa., as the two teams play in front of the Little League World Series participants as part of the eighth annual Little League Classic.

Our Mariners vs. Mets prediction supports Seattle as -120 moneyline neutral site favorites at our top sports betting sites.

New York slugger Juan Soto has been thriving against Seattle righty George Kirby in a small sample size, but Kirby’s impressive eight-week stretch has me fading Soto with my Mariners vs. Mets best bets for Sunday Night Baseball.

First pitch from BB&T Ballpark at Historic Bowman Field is set for 7 p.m. ET and airs on ESPN.

🔢 Mariners vs. Mets odds & betting lines

Here are the latest Mariners vs. Mets odds and betting lines from our best live betting sites.

💰 Best Mariners vs. Mets predictions: Sunday Night Baseball

Here are my best Mariners vs. Mets Sunday Night Baseball predictions for today's MLB matchup. Be sure to check out the rest of our MLB picks along with our guide on how to bet on the MLB.

📊 Who will win today's Sunday Night Baseball matchup?

As of Sunday morning, the Mariners are favored to beat the Mets in tonight's MLB matchup at 7 p.m. ET from BB&T Ballpark at Historic Bowman Field in Williamsport, Pa. I’m predicting the Mariners will beat the Mets as -120 moneyline favorites, as New York has lost 10 of its last 11 games against teams with a winning record. I would play Seattle up to -135.

🎯 Best Mariners vs. Mets player props for Sunday Night Baseball

Soto is one of the only players on either team with experience in the Little League Classic after last year’s 0-for-3 performance with the New York Yankees. Although he is 3-for-3 in his career against Seattle righty George Kirby, the righty’s improvements of late have me fading Soto as my best Mariners vs. Mets player prop for Sunday Night Baseball.

Kirby has pitched to a 2.32 ERA with a 27.1% strikeout and 475 K-to-walk rate over his last nine starts. In that span, he is the only pitcher in the majors who has induced a 30% whiff rate or better on his four-seam fastball and slider.

Soto has homered in five of his last nine games, but I am ruling out a long ball tonight as Kirby has allowed just two home runs over his previous 54 ⅓ innings.

And with walks not counting towards a hitter’s total bases (Soto has drawn a walk in six of his last seven games), that lowers his chances of going over this projected total.

Best player prop: Juan Soto Under 1.5 total bases (-160 via DraftKings)

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1️⃣ NRFI bet for Sunday Night Baseball: NRFI (-120 via BetMGM)

The NRFI has cashed in each of Seattle’s last six games as favorites against National League opponents. Along with Kirby throwing so well and Clay Holmes pitching to a 2.25 ERA in the first inning this year, I am backing the NRFI as part of my Mariners vs. Mets best bets for Sunday Night Baseball.

📈 Mariners vs. Mets betting insights

Here are some betting insights in the hours before first pitch from BetMGM:

The Mets are drawing 53% of the bets on the moneyline as the underdog (+105) and 64% of the handle
The Under on 8.5 runs is generating 51% of the bets and 61% of the handle
The Mets are getting 53% of the bets to cover +1.5, while the Mariners are receiving 69% to cover -1.5

📺 How to watch Sunday Night Baseball

⚔️ Matchup: Mariners vs. Mets
📅 Date: Aug. 17
🕗 Time: 7 p.m. ET
📍 Location: BB&T Ballpark at Historic Bowman Field (Williamsport, Pa.)
📺 TV: ESPN
💻 Streaming: YouTube TV

💡 Expert MLB predictions today

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Written by:
Mike Spector

Mike started in the sports writing industry in July 2019, and gained a lot of followers in his first year after finishing with the No. 2 overall record in an annual NFL betting competition, which made picks against the spread, and from an Over/Under and moneyline perspective. Mike is an avid fan of the NFL, MLB, tennis, and all college sports. In his opinion, March Madness is the best sporting event there is, and he's especially euphoric starting with conference tournament time in college basketball. Mike's a big advocate of "fading the public" and making plays that are contrarian, constantly citing that "there are reasons why they have those big shiny buildings in Las Vegas." When making wagers, Mike always scours the best odds at all of the major sports betting sites, where he mostly sifts through DraftKings, FanDuel, BetMGM, and bet365. He's tried several others and is of the firm belief that bettors should not just stick to one sportsbook, as there is always likely better value to be had with the same wager. In addition, while Mike received his undergraduate degree from Villanova University, he has no issue betting against the Wildcats when it comes to college basketball wagering, and suggests other bettors should always put their “head” before their “hearts.”