The Seattle Mariners host the Arizona Diamondbacks on May 30, 2026. First pitch from T-Mobile Park is scheduled for 10:10 p.m. EDT. The game will be broadcast on SEAM.
The Mariners are favored by -156 on the moneyline and by -1.5 on the run line. The Diamondbacks are +127 on the moneyline and +1.5 on the run line. The total is set at 7 runs.
Find my MLB picks and Diamondbacks vs Mariners prediction below, as well as probable pitchers, weather report, and more.
Diamondbacks vs Mariners Prediction
- Diamondbacks vs Mariners Pick: Bryan Woo Over 5.5 Strikeouts (-106, DraftKings)
My Diamondbacks vs Mariners best bet is on B.Woo to record 6+ strikeouts. Make sure to find the best odds by checking our live MLB odds page.
Diamondbacks vs Mariners Odds
| Diamondbacks Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
+1.5 +143 | 7 -105o / -115u | +127 |
| Mariners Odds | ||
|---|---|---|
| Spread | Total | Moneyline |
-1.5 -170 | 7 -105o / -115u | -156 |
- Diamondbacks vs Mariners moneyline: Diamondbacks +127, Mariners -156
- Diamondbacks vs Mariners over/under: 7 (-105o / -115u)
- Diamondbacks vs Mariners spread: Mariners -1.5 (+143 ), Diamondbacks +1.5 (-170)
Diamondbacks vs Mariners Probable Pitchers
| Ryne Nelson | Stat | Bryan Woo |
|---|---|---|
| 31-25 | W-L | 29-29 |
| 0.2 | fWAR (FanGraphs) | 1.5 |
| 4.65 / 4.47 | ERA / xERA | 3.82 / 3.11 |
| 4.81 / 4.73 | FIP / xFIP | 3.19 / 3.98 |
| 11.8 | K-BB% | 17.6 |
| 30.4 | GB% | 33.3 |
| .236 | BABIP | .263 |
| 105 | Stuff+ | 110 |
| 102 | Location+ | 108 |
Diamondbacks vs Mariners MLB Betting Preview
Diamondbacks vs Mariners Pick, Betting Analysis
Lets wrap this one up with a strikeout prop.
Although he struck out only four last time out against a contact prone Kansas City lineup, Bryan Woo had struck out 26 of his previous 67 batters with a 14.0 SwStr%.
While his 23 K% on the season is 4.1 points below last season, he’s still striking out 29.1% of batters faced at home, just 0.5 points below last year and that’s because the Mariners boost strikeout rates by 15% for LHBs and 21% for RHBs.
That means the Diamondbacks projected lineup that averages a 19.8 K% vs RHP since last season boosts up to at least 22.7% and that’s only if they were all left-handed. That's also projecting Arenado's return (14.6% vs RHP since 2025).
I have the true boost (projected RH & LHBs) around 18% for this game with a further 4% boost for umpire David Rackley.
That brings my overall strikeout rate expectation for Woo close to 30% for this start. Averaging 23 batters faced, I’d project him for closer to seven than six and see some value in this number up to -120.
Pick: Bryan Woo Over 5.5 Strikeouts (-106, DraftKings)
