The Cleveland Guardians take a 2-1 series lead into the final game of this four-game set against the Seattle Mariners at T-Mobile Park, and what a series it has already been. Rookie Chase DeLauter has announced himself to the big leagues in spectacular fashion, while both lineups have traded haymakers all week. Sunday Night Baseball kicks off its 2026 run on NBC and Peacock with a series finale that is important for both teams. Here, I break down the action and you can find my Guardians vs Mariners prediction below.
Guardians vs Mariners Pick
- Pick: Cleveland Guardians Moneyline
- Confidence: 3 out of 5
Game Snapshot
- Matchup: Cleveland Guardians vs Seattle Mariners
- Date & Time: Sunday, March 29, 2026, 7:20 PM ET
- Starting Pitchers: Slade Cecconi vs Emerson Hancock
- Stadium: T-Mobile Park, Seattle, Washington
- Broadcast: NBC / Peacock
Key Storylines
Pitching Matchup
Neither starter inspires a ton of confidence, which is what makes this game so interesting from a betting perspective. Slade Cecconi finished 2025 with a 7-7 record and a 4.30 ERA, but there are silver linings worth noting. He was better away from home last season, putting up a 3.75 ERA on the road, and his arsenal of pitches gives him enough variety to keep lineups off-balance when his command is right. The knock on Cecconi is straightforward: when his breaking pitches are not working, hitters can sit on a mediocre fastball and punish him.
Emerson Hancock enters Sunday with a 4.90 ERA from a 4-5 campaign in 2025, numbers that would normally alarm bettors. However, he has one thing going for him that matters in this specific spot, he has been effective against Cleveland before, throwing 7.0 innings without allowing an earned run in a previous outing. This is his 2026 debut, so the small-sample concerns that apply to Cecconi apply here as well, but Seattle will lean on that prior success as a reason for optimism.
Key Players
Chase DeLauter is the story of this series and the early story of the 2026 season. The Guardians rookie outfielder launched home runs in each of his first 3 career games, becoming only the third player in MLB history to accomplish that feat. He already has 4 home runs and 5 RBI through the first 3 games. His emergence gives Cleveland a genuine power threat who can change a game at any moment.
For Seattle, Cal Raleigh has struggled to get going early, going hitless with multiple strikeouts before finally breaking through. Luke Raley has been a consistent source of production, having homered in 3 consecutive games this series. Randy Arozarena and Brendan Donovan give the Mariners enough pop to be dangerous at any point.
Guardians vs Mariners Model Projection
- Score Projection: Cleveland 4 – Seattle 3
- Win Probability: Cleveland 55%, Seattle 45%
Sunday’s series finale is genuinely a coin flip. The oddsmakers have Seattle installed as a favorite, and the home park, the bullpen depth, and Hancock’s prior success against Cleveland are all legitimate reasons for that. But the market is giving Cleveland away at plus money, and I think there is some real value there based on what we’ve seen in this series so far. I’ll take the Guardians to get the win to close out this series in style, with DeLauter making an impact yet again.
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