Luis Castillo will take the mound in what were friendly confines for him last season as the New York Yankees open a series with the Seattle Mariners.
On the other side, Ryan Weathers will make his debut for the Bronx Bombers after being acquired from the Marlins last season. We think this pitch pairing sets up both teams to keep the runs down.
My Yankees vs. Mariners predictions and MLB picks break down why we like a low-scoring affair on Monday, March 30.
Yankees vs Mariners predictions
Yankees vs Mariners best bet: Under 7.5 (-110)
Luis Castillo's home numbers last season were legitimate: a 2.60 ERA and 1.00 WHIP across 100+ innings, with his strikeout rate jumping to 25%. He's in a position to attack a New York Yankees lineup with plenty of swing and miss.
On the other hand, it is difficult to know what to make of Ryan Weathers, but a short outing is a near certainty. That will turn things over to a well-rested New York bullpen that has yet to allow a run this season.
Two quality pitching outings (one by committee) in one of baseball's most suppressive offensive environments.
COVERS INTEL: Luis Castillo's 2.11 ERA home-road differential last season was among the largest of any qualified starter. Quite frankly, he was literally a different pitcher at home than away..
Yankees vs Mariners same-game parlay (SGP)
While the sample is small, it’s pretty easy to say the Yankees haven’t fixed much of the strikeout issues that have plagued them for the (checks notes) at least the last five years.
They are averaging just under 10 over the first three games, but the whiff rate remains in the Top 5 of the league, much like it has over the past few seasons.
With that in mind and the context of Castillo at home, I paired his strikeout number with the best bet for today’s SGP.
Yankees vs Mariners SGP
- Under 7.5
- Luis Castillo Over 5.5 strikeouts
Yankees vs Mariners home run pick: Randy Arozarena (+475)
Randy Arozarena is in a good spot if he can avoid the whiff (and he’s done a good job of that so far this season). Few players on the Seattle Mariners roster hit the ball harder than him consistently, and his early-season barrel rate reeks of someone due for a bomb.
What’s particularly noteworthy about this matchup is how it lines up with the pitch mix of Weathers. He’s mostly a two-pitch thrower, and Arozarena was in the top three of Mariners players in hard-hit rate last season against the two pitches he’ll see.
- Best bets: 1-1, -0.2 units
- SGPs: 1-1, +1.05 units
- HR picks: -3, -3.0 units
Yankees vs Mariners odds
- Moneyline: New York -110 | Seattle -110
- Run line: New York +1.5 (-225) | Seattle -1.5 (+195)
- Over/Under: Over 7.5 | Under 7.5
Yankees vs Mariners trend
The Yankees have cashed the first-five moneyline in 42 of their last 70 games for +16.15 units and a 14% ROI. Find more MLB betting trends for Yankees vs. Mariners.
How to watch Yankees vs Mariners and game info
| Location | T-Mobile Field, Seattle, WA |
| Date | Monday, March 30, 2026 |
| First pitch | 9:40 p.m. ET |
| TV | YES, SEAM |
| Yankees starting pitcher | Ryan Weathers (2025: 2-2, 3.99 ERA) |
| Mariners starting pitcher | Luis Castillo (2025: 11-8, 3.54 ERA) |
Yankees vs Mariners latest injuries
Yankees vs Mariners weather
Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
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