Major League Baseball team season
2026 Seattle MarinersLeague American League Division West Ballpark T-Mobile Park City Seattle, Washington Owners Baseball Club of Seattle, LP, represented by CEOJohn Stanton President of baseball operations Jerry Dipoto General manager Justin Hollander Manager Dan Wilson Television Root Sports Northwest (Aaron Goldsmith ,Jay Buhner ,Dave Valle ,Angie Mentink ,Ryan Rowland-Smith ,Bill Krueger ,Jen Mueller , Brad Adam)Radio ESPN-710 Seattle Mariners Radio Network (Rick Rizzs , Gary Hill Jr.,Mark McLemore ,Ken Phelps ,Angie Mentink ,Ryan Rowland-Smith ,Shannon Drayer )
The2026 Seattle Mariners season will be the 50th season in franchise history and their 27th full season (28th overall) atT-Mobile Park , their homeballpark inSeattle, Washington . The Mariners will open and close their season in Seattle, withopening day season on March 26, 2026 against theCleveland Guardians and the regular season finale on September 27 against theLos Angeles Angels .
The Mariners plan to retireRandy Johnson 's uniform number 51 on May 2. The number was retired in the2025 season forIchiro Suzuki .[ 1] [ 2] The Mariners will wear a uniform patch commemorating their 50th season.[ 3]
November 2, 2025:Josh Naylor ,Eugenio Suárez ,Caleb Ferguson , andLuke Jackson electedfree agency .[ 4] [ 5] November 3: The Mariners declinedMitch Garver 's $12 million mutual option, paying him a $1 million buyout and making him a free agent.[ 6] November 5: PitcherCole Wilcox traded by theTampa Bay Rays to Seattle for cash.[ 7] November 6:Jorge Polanco declined a $6 million option, receiving a $750,000 buyout, and elected free agency.[ 8] The Mariners claimed pitcherRyan Loutos off waivers from theWashington Nationals .[ 9] November 16: Minor league pitcherRobinson Ortiz traded by theLos Angeles Dodgers to Seattle for minor league pitcher Tyler Gough.[ 5] November 17: Naylor signed a five-year, $92.5 million contract with the Mariners.[ 10] November 18: TheBoston Red Sox traded minor league pitcherAlex Hoppe to the Mariners for minor league catcher Luke Heyman. The Mariners designated pitcherTayler Saucedo for assignment.[ 11] Saucedo elected free agency two days later.[ 5] November 21: The Mariners non-tenderedTrent Thornton andGregory Santos , making them free agents.[ 12] Legend Mariners win Mariners loss Postponement Bold Mariners team member
2026 Game Log: 0–0 (Home: 0–0; Road: 0–0) March/April: 0–0 (Home: 0–0; Road: 0–0)
May: 0–0 (Home: 0–0; Road: 0–0)
June: 0–0 (Home: 0–0; Road: 0–0)
July: 0–0 (Home: 0–0; Road: 0–0)
August: 0–0 (Home: 0–0; Road: 0–0)
September: 0–0 (Home: 0–0; Road: 0–0)
Source [ 13]
Seattle Mariners 2026 spring training roster
40-man roster Non-roster inviteesCoaches / other Catchers
Infielders
Outfielders
Manager
Coaches
Sources [ 14] [ 15]
The Mariners will have a newSingle-A affiliate in 2026, asDiamond Baseball Holdings moved theModesto Nut s after the 2025 season toSan Bernadino to become theInland Empire 66ers .[ 16] [ 17]
^ "Mariners to Retire Randy Johnson's #51 During 2026 Season" (Press release).Seattle Mariners . RetrievedNovember 19, 2025 – via MLB.com.^ "Mariners to Retire Randy Johnson's #51 on May 2" (Press release).Seattle Mariners . RetrievedNovember 23, 2025 – via MLB.com.^ Van Til, Cameron (November 19, 2025)."Seattle Mariners unveil jersey patch for 50th season" .Seattle Sports . RetrievedNovember 23, 2025 . ^ Heyen, Billy (November 2, 2025)."Mariners have 4 players, including 2 stars, officially entering free agency" .Sporting News . RetrievedNovember 18, 2025 . ^a b c "Transactions - November 2025" .MLB.com . RetrievedNovember 18, 2025 .^ Deeds, Nick (November 3, 2025)."Mariners Decline Mutual Option On Mitch Garver" .MLB Trade Rumors . RetrievedNovember 18, 2025 . ^ Heyen, Billy (November 5, 2025)."Mariners make trade with Rays for 6-foot-5 righty who throws 97 MPH" .Sporting News . RetrievedNovember 18, 2025 . ^ "M's Polanco a free agent after declining option" .ESPN . Associated Press. November 6, 2025. RetrievedNovember 18, 2025 .^ Stecker, Brent (November 6, 2025)."Seattle Mariners add a reliever with interesting backstory" .Seattle Sports . RetrievedNovember 18, 2025 . ^ Perry, Dayn (November 18, 2025)."Josh Naylor re-signing with Mariners: First baseman back to Seattle on five-year deal" .CBS Sports . RetrievedNovember 18, 2025 . ^ Kramer, Daniel (November 18, 2025)."Mariners add bullpen depth with trade for Hoppe" .MLB.com . RetrievedNovember 19, 2025 . ^ Jude, Adam (November 21, 2025)."Mariners non-tender three relievers, opening up roster space" .The Seattle Times . RetrievedNovember 23, 2025 . ^ Pfeffinger, Ramsey (August 26, 2025)."Seattle Mariners release 2026 schedule" .Fox 13 Seattle . ^ "Seattle Mariners Minor League Affiliates" .Baseball Reference . RetrievedNovember 18, 2025 .^ "MiLB Teams by Affiliate: Team Names and Logos for each Club" .MLB.com . RetrievedNovember 18, 2025 .^ Correa, Christopher (December 12, 2024)." 'It's real this time': Nuts to be relocated from Modesto after Mariners sell team" .Turlock Journal . RetrievedNovember 18, 2025 . ^ Heft, Erin (September 1, 2025)."Modesto Nuts play final home game before moving to Southern California" .KCRA . RetrievedNovember 18, 2025 .
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