The Washington Nationals host the Seattle Mariners on June 13, 2026. First pitch from Nationals Park is scheduled for 4:05 p.m. EDT. The game will be broadcast on SEAM.
The Mariners are favored by -110 on the moneyline and by -1.5 on the run line. The Nationals are -110 on the moneyline and +1.5 on the run line. The total is set at 9 runs.
Find my MLB picks and Mariners vs Nationals prediction below, as well as probable pitchers, weather report, and more.
Mariners vs Nationals Prediction
- Mariners vs Nationals Pick: Josh Naylor Over 1.5 Hits
My Mariners vs Nationals best bet is on Josh Naylor's Over. Make sure to find the best odds by checking our live MLB odds page.
Mariners vs Nationals Odds
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 -184 | 9 -105o / -112u | -110 |
| Nationals Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 +150 | 9 -105o / -112u | -110 |
- Mariners vs Nationals moneyline: Mariners -110, Nationals -110
- Mariners vs Nationals over/under: 9 (-105o / -112u)
- Mariners vs Nationals spread: Mariners -1.5 (+150), Nationals +1.5 (-184)
Mariners vs Nationals Probable Pitchers
| Luis Castillo (RHP, SEA) | Stat | Cade Cavalli (RHP, WSH) |
|---|---|---|
| 2-5 | W-L | 3-4 |
| 0.6 | fWAR (FanGraphs) | 1.4 |
| 5.16 / 4.91 | ERA / xERA | 3.88 / 4.37 |
| 4.19 / 4.28 | FIP / xFIP | 3.37 / 3.92 |
| 14.0% | K-BB% | 16.3% |
| 36.9% | GB% | 46.3% |
| .299 | BABIP | .355 |
| 98 | Stuff+ | 102 |
| 108 | Location+ | 95 |
Mariners vs Nationals MLB Betting Preview
If you're looking to target a player on an absolute tear with a distinct structural matchup advantage, Action Network's PRO Projections are all over this in today's Mariners vs Nationals duel.
Josh Naylor has been an absolute machine at the plate lately. He has recorded a hit in eight of his last 10 games, showcasing incredible night-to-night consistency.
More importantly for this specific prop line, he has cleared his Over hits mark in six of his last 10 outings. When a hitter is in a groove like this, multi-hit games cease to be a high-variance ceiling and instead become an expectation.
While Naylor doesn't have a formal head-to-head history against Washington's starting pitcher, Cade Cavalli, the underlying analytical profile tells us everything we need to know.
On the surface, Cavalli has been perfectly fine this season with a steady 3.88 ERA. However, the advanced metrics suggest he's been dancing between raindrops. His xERA sits at 4.37, signaling that heavy negative regression is looming on the horizon.
The main culprit for that upcoming regression? Cavalli's fastball.
Cavalli loves to throw his heater, but he simply isn't getting good results. According to Baseball Savant, Cavalli ranks in just the 14th percentile in Fastball Run Value. He leaves it over the heart of the plate far too often—and that spells disaster against Josh Naylor.
Naylor is a hitter who likes things straight and to the point. His splits speak for themselves:
- Batting Average vs. Fastballs: .287
- Batting Average vs. All Other Pitches: .218
Mariners vs Nationals Pick, Betting Analysis
There is a strategic risk here. Cavalli's offspeed pitches have been significantly better than his heater, meaning the Nationals' coaching staff could pivot and instruct him to attack Naylor with a heavy dose of breaking stuff.
But pitchers are ultimately creatures of habit. When Cavalli gets into trouble, falls behind in the count, or needs a desperate strike, he is going to default to his fastball.
Given the sheer atomic heater Naylor is currently riding, combined with Cavalli's propensity to leak meatballs over the plate, walking away from a +199 price tag on this prop is impossible to ignore.
Pick: Josh Naylor Over 1.5 Hits (+185, bet365)
