Rangers vs. Mariners Prediction, Odds & Best Bets: Seattle Has Momentum Following Trades

The Seattle Mariners have made one of the biggest moves of an already-busy MLB trade deadline, and they'll look to begin post-deadline life with a big win against their division rivals.

Andrew Brennan

Last Updated: July 31, 2025 5:49 PM EDT • 4 minute read

Pictured: Seattle Mariners catcher Cal Raleigh headlines our Rangers vs. Mariners prediction, as we expect him to strengthen his AL MVP campaign. Photo by Kiyoshi Mio via Imagn Images.

Seattle has made one of the biggest moves ahead of the MLB trade deadline by acquiring slugger Eugenio Suarez, and our Rangers vs. Mariners prediction expects the home favorites to get a jolt of energy for this divisional showdown.

We already featured two hitters in this game in our home run predictions today, but we're going to turn our attention to one of the pitchers for our Rangers vs. Mariners best bets. Kumar Rocker gets the ball for the visitors when this one gets underway at 9:40 p.m. ET from T-Mobile Park, and I expect him to have a rough night at the office.

Rangers vs. Mariners prediction: Mariners to win (-170 via bet365) ⭐⭐⭐⭐
Best Rangers vs. Mariners player props: Kumar Rocker Under 4.5 strikeouts (+115 via DraftKings) ⭐⭐⭐⭐⭐

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✅ Rangers vs. Mariners prediction: Mariners to win (-170 via bet365)

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I'm betting on two different Mariners - Cal Raleigh and Jorge Polanco - to hit home runs in what I expect to be a comfortable win for Seattle. And the best sports betting sites would seem to agree based on how they're pricing this AL West showdown.

The Suarez trade sent a clear message to the players that the Mariners are going for it, and that's all these guys ever ask for. I think they're going to have a ton of momentum heading into this one as a result, and they'll use that to bludgeon Rocker and the Rangers bullpen.

If that wasn't enough, George Kirby is on the mound for Seattle. He's struggled somewhat this season, but he's still George Kirby. This should be fairly comfortable for Seattle.

💰 Best Rangers vs. Mariners player props

✅ Best Rangers vs. Mariners player prop: Kumar Rocker Under 4.5 strikeouts (+115 via DraftKings)

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Listen, I wanted Rocker to be good this year. I bet on him to win AL Rookie of the Year before the season started. Unfortunately, he's not good. He's been really, really bad.

Rocker profiled as a potential strikeout artist with good swing-and-miss. However, his swinging-strike rate is middling at best and he's managing only 7.99 K/9.

The only thing that scares me about this bet is the addition of Suarez to this lineup. Yes, he's got a ton of power, but he also strikes out a lot. Let's hope for the former tonight.

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The run line in baseball is a form of point spread betting unique to MLB. It typically sets a standard spread of 1.5 runs, meaning the favored team must win by at least two runs to cover the run line, while the underdog can lose by one run or win outright to cover.

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Written by:
Andrew Brennan

Andrew Brennan is a publishing editor for Sportsbook Review. He also heads the website’s MLB coverage, from the various futures markets to daily picks. Andrew believes a math-based approach is the best way to enjoy long-term success in sports betting, and he’s spent the better part of the last year fine-tuning his own process for MLB, NBA, and NFL picks. Andrew uses eight different sportsbooks to find the best odds available and various projection models to gather as much information as he can. His most used sportsbooks are bet365, FanDuel, and theScore Bet. When it comes to daily projection models, he regularly references NumberFire across all sports, as it’s one of the best free tools available. In terms of which daily markets Andrew attacks, he almost exclusively bets on pitcher strikeouts for baseball. When the winter rolls around, you’ll see him providing more variety when it comes to the NBA (points, assists, rebounds) and NFL (almost any offensive-based player prop). He used these tools to go +150 units in 2023. Andrew is also a passionate fantasy sports player. He’s played fantasy football, fantasy Premier League, and fantasy baseball for the last decade. He graduated from Durham College with his diploma in journalism after earning his degree in law from Carleton University. He’s worked in sports media since early 2017, first contributing at FanSided before moving to theScore. He joined SBR in 2022.