Guardians vs. Mariners Prediction, MLB Picks, Spread for MLB Opening Day

The Seattle Mariners were one win away from the World Series last season; they'll begin their quest to the 2026 Fall Classic on Thursday, in an opening Day matchup vs. the Cleveland Guardians.

The Mariners are listed as home favorites with a 1.51x payout on PrizePicks against the Guardians at 10:10 p.m. ET.

Cleveland closed on a 19-4 run last season to capture the AL Central championship, but fell to Detroit in the AL Wild Card round. 

Seattle led Toronto, 3-2 in the American League Championship series, but lost the final two games on the road, preventing the M’s from their first World Series appearance in franchise history.

Let’s look at our Guardians vs. Mariners prediction for Thursday’s battle at T-Mobile Park, with Tanner Bibee vs. Logan Gilbert

Make your MLB Opening Day picks on PrizePicks and PrizePicks Team Picks and earn real money if you’re right, including on game winners, spreads, and totals!

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Guardians vs. Mariners Prediction, Spread, Over/Under – Thursday, March 26

Seattle captured four of six matchups last season, including a three-game home sweep in June. In five of those games, the Mariners scored at least 4 runs. Cleveland was held to 3 or fewer runs in four meetings.

Guardians vs. Mariners Spread, Over/Under

The Mariners enter this matchup as home favorites, returning a 1.51x payout on PrizePicks Team Picks if they win outright.

The Guardians are road underdogs with a 2.43x payout if they win, via PrizePicks Team Picks.

• Spread: Seattle Mariners -1.5 (2.17x)
• Over/Under: 6.5
• Game Winner Payout: Guardians 2.43x | Mariners 1.51x

Team Picks data is live at the time of writing and is subject to change.

Guardians vs. Mariners Prediction on Spread – 3/26/26

Here are some key stats to know before locking in your Guardians vs. Mariners prediction on spread for Thursday, March 26 on PrizePicks.

• The Mariners compiled the second-best home record in the AL last season at 51-30.
• Cleveland’s incredible September run included a 9-1 stretch in its final 10 road games.
• Seattle won nine of Logan Gilbert’s 13 home starts, compared to a 6-6 away mark.
• The Guardians were up and down when Tanner Bibee started on the road, posting a 9-8 record. 
• In both starts Bibee made against the Mariners, the Guardians scored a total of seven runs, and they lost each time.
• Out of the six division winners last season, Cleveland produced the fewest runs with 643. The team ahead of them was Seattle, who plated 766 runs. 
• The Guardians cleaned up against their division at 36-16, but went 15-15 against AL West opponents.
• Seattle fared well against the AL Central, going 21-11, including an 11-5 mark at home.

Guardians vs. Mariners Starting Lineup for Thursday, March 26

Guardians vs. Mariners lineups for March 26 are projected and not official. Projected MLB Lineups via RotoWire.

Cleveland Guardians Lineup vs. Mariners

Guardians Starting Pitcher: Tanner Bibee – 4.17 xFIP, 3.62 xERA, 8.00 K/9

1. LF Steven Kwan
2. CF Chase DeLauter
3. 3B Jose Ramirez
4. 1B Kyle Maznardo
5. DH Rhys Hoskins
6. C Bo Naylor
7. SS Gabriel Arias
8. RF CJ Kayfus
9. 2B Brayan Rocchio

Seattle Mariners Starting Lineup vs. Guardians

Mariners Starting Pitcher: Logan Gilbert – 2.95 xFIP, 3.08 xERA, 11.89 K/9

1. 3B Brendan Donovan
2. C Cal Raleigh
3. CF Julio Rodriguez
4. 1B Josh Naylor
5. RF Randy Arozarena
6. DH Dominic Canzone
7. RF Luke Raley
8. 2B Cole Young
9. SS Leo Rivas

Guardians vs. Mariners Picks on PrizePicks for MLB Opening Day – 3/26/26

Here are three top Guardians vs. Mariners picks to target on Thursday. Top MLB picks on PrizePicks are headlined by three players: Mariners P Logan Gilbert, Guardians P Tanner Bibee, and Seattle C Cal Raleigh.

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Mariners P Logan Gilbert vs. Guardians Projection: 6 Strikeouts

• Gilbert eclipsed his K projection in 8 of 13 home starts last season. 
• He averaged 7.7 strikeouts at T-Mobile Park, including 10 outings of at least 7 Ks.
• In his lone start against Cleveland, he closed with 6 punchouts in 6 innings.
• In three outings versus the Guardians since 2023, Gilbert registered at least 6 Ks.
• Gilbert’s K output dropped from 220 in 2024 to 173 last season. However, he made eight fewer starts and improved to 6.9 Ks per start.
• Last season, 90 of his strikeouts came via the split finger. Cleveland slugger Jose Ramirez owned a 27.1% whiff rate against that pitch, while SS Brayan Rocchio whiffed at a 36.4% rate.

Guardians P Tanner Bibee vs. Mariners Projection: 5 Strikeouts

• In two starts against Seattle last season, Bibee produced 3 Ks in a 4-3 road loss and 4 Ks in a 4-2 home defeat.
• The Cleveland right-hander finished below his K projection in 19-of-31 starts in 2025. 
• The Mariners struck out 809 times against starting pitchers last season, the ninth-most in MLB.
• However, Seattle’s offense registered 543 Ks against right-handed starters in 115 games, an average of 4.72 Ks per outing.
• Bibee’s K% sat at 40%, along with a whiff rate of 37% in 2025, both significant drops from 2024.

Mariners C Cal Raleigh vs. Guardians Projection: 1.5 Hits+Runs+RBIs

• Raleigh posted a career-high 60 home runs last season, while ranking in the 99th percentile in barrel percentage (19.5%).
• In six games against Cleveland last season, he batted 2-of-17 and didn’t drive in a single run. 
• Raleigh has struggled against Bibee in his career, striking out three times and picking up a double in seven at-bats.
• Bibee succeeded most last season with his sweeper, limiting opponents to a .168 average. Raleigh’s batting average against the sweeper in 2025 sat at .182, his lowest against any type of pitch.

Make Your MLB Opening Day Picks on PrizePicks

Two division winners from last season hook up in Seattle to begin the 2026 campaign, though one has higher expectations for the 2026 season. Will the Mariners capitalize on their ALCS run with a victory or will the Guardians spoil the party in Seattle?

There’s never been a better time to add to the excitement of every MLB Opening Day moment than with PrizePicks.

There is a wide variety of player stat projections on the MLB board, so you can build your Lineup however you’d like — with no salary or positional restrictions. Just pick at least two player stat projections to build your Lineup on PrizePicks. Or, make your picks on winners, spreads, and over/unders on Team Picks, now available in 35 states.

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