SEA @ COL MLB prediction: AI analysis & picks
Our picks for this match
Our Expert Analysis
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PROBABLE STARTERS
GAME CONTEXT
Game 1 of a 3-game interleague series at Coors Field. Colorado is 56-97 on the season; Seattle sits at 71-82. The Mariners have taken 4 of the last 5 head-to-head matchups against the Rockies.
KEY ABSENCES
GAME SCRIPT
Bryan Woo comes in riding a sharp stretch: 6.0 IP, 0 ER on September 12, following an 8.0 IP, 0 ER, 9-K gem on September 6 — two outings defined by run suppression and clean pitch efficiency. On the other side, Gabriel Hughes (xERA 6.40) lasted just 2.0 IP in his last start (5 ER, 5 H on September 13), and none of his last five outings have gone beyond 5.0 IP, meaning Colorado's bullpen (14-day ERA: 5.91) will be called early and often. Seattle's bullpen comes in at 3.86 ERA over the same stretch — a clear edge once the game shifts to the back end. Coors Field's park factor (1.32) raises the offensive floor across the board, but a 5 mph breeze and a possible evening storm could take some of that ballpark juice away.
OUR ANALYSIS
The AWAY -1.5 run line at 62% confidence is built on one of the sharpest starter mismatches on today's slate. Woo (xERA 3.53) against a Colorado lineup posting a .320 wOBA vs. starters should keep the Rockies quiet through the first five innings. Hughes (xERA 6.40) is essentially a bullpen game waiting to happen — and Colorado's relief corps (5.91 ERA, 14-day) is the last group you want logging extended innings at Coors. Seattle's bullpen (3.86 ERA, 14-day) provides the coverage needed to protect a 2-run lead into the final outs, which is exactly the script this matchup sets up.
Coors Field (park factor 1.32) can turn any shaky outing into a full meltdown — and Woo's August 26 game log (4.0 IP, 6 ER) is a reminder he is not immune. Hughes also flashed a solid line on September 8 (5.0 IP, 1 ER); if he reproduces that form, Colorado stays alive long enough to make -1.5 a grind. The storm risk adds a real layer of uncertainty over how this evening game plays out. That said, the xERA gap (6.40 vs. 3.53) and the bullpen edge are too pronounced to walk away from this line.
Woo vs. Hughes is one of the most lopsided starter matchups on the board tonight. We're backing Seattle -1.5 with a stake proportionate to the 62% confidence level.
Key Factors
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Head-to-Head
Form & Stats
Team Comparison
5 of 39 model features (last 5-10 games)
SEA
STAT
COL
| Date | Game | Score |
|---|---|---|
| 09/16 | @ LAA | 7-2 |
| 09/15 | @ LAA | 1-2 |
| 09/14 | @ LAA | 4-6 |
| 09/13 | @ OAK | 7-8 |
| 09/12 | @ OAK | 19-1 |
| Date | Game | Score |
|---|---|---|
| 09/17 | vs SDP | 2-9 |
| 09/16 | vs SDP | 3-9 |
| 09/15 | vs SDP | 9-3 |
| 09/14 | vs SDP | 7-8 |
| 09/13 | @ DET | 1-8 |
| Pitcher | Starts | F5 vs Line | F5 Over% | F5 Signal | FT vs Line | FT Over% | FT Signal |
|---|---|---|---|---|---|---|---|
| Bryan Woo (AWAY) | 17 | 1.53 | 64.7% | OVER | 0.00 | 50.0% | - |
| Date | vs | IP | ER | H | BB | K | ERA |
|---|---|---|---|---|---|---|---|
| 09/24 | LAA | 5.33 | 4 | 7 | 3 | 8 | 6.75 |
| 09/18 | COL | 5.33 | 3 | 10 | 1 | 4 | 5.07 |
| 09/12 | OAK | 6.00 | 0 | 3 | 2 | 5 | 0.00 |
| 09/06 | OAK | 8.00 | 0 | 1 | 2 | 9 | 0.00 |
| 09/01 | BOS | 6.00 | 1 | 5 | 1 | 7 | 1.50 |
| Date | vs | IP | ER | H | BB | K | ERA |
|---|---|---|---|---|---|---|---|
| 09/18 | SEA | 4.67 | 3 | 5 | 1 | 6 | 5.78 |
| 09/13 | DET | 2.00 | 5 | 5 | 2 | 2 | 22.50 |
| 09/08 | NYY | 5.00 | 1 | 4 | 0 | 6 | 1.80 |
| 09/01 | BAL | 4.67 | 1 | 4 | 2 | 4 | 1.93 |
| 08/27 | WSN | 5.00 | 4 | 7 | 4 | 3 | 7.20 |
Frequently asked questions
When was SEA @ COL played?
This MLB game was played on 2026-09-18.
Where can I find the prediction for SEA @ COL?
This ProbWin page shows the predictions our model published before the game (F5 and full-game totals, spreads), the key stats for both sides, and the settled result — every prediction is kept, win or lose, in our public track record.
How are these predictions calculated?
Our MLB statistical models are trained on league history and recomputed daily from team and player stats plus market odds. Every prediction is published before the game and its result is settled publicly.
