MLB matchup analysis
Athletics vs Mariners Prediction, Odds and Model Pick
Saturday, September 5, 2026 at T-Mobile Park · 9:40 PM ET
Leo decision: Pass on Athletics vs Mariners
The case for Seattle Mariners
The case for Athletics
Why it is not official
Why the setup score is what it is
Why the price is what it is
Read the full model output
The combined Lab Rating did not clear the official threshold.
Final result
Athletics 6, Mariners 2
How the analysis held up
Athletics won. Leo's model favored the other side.
Leo's two internal reads disagreed pregame by 63.6 points — the team-strength model favored Seattle Mariners, the run-projection model favored Athletics. The run-projection model had the winner here.
George Kirby (Seattle Mariners) was Leo's favored starter by pitcher score, but Jeffrey Springs actually pitched better tonight: 7.0 IP, 0 ER (0.00 ERA) against 6.2 IP, 3 ER (4.05 ERA). The edge did not show up in this game.
The Athletics bullpen was flagged as elevated risk pregame (High risk). In relief it actually allowed 2 earned runs over 2.0 innings (9.00 ERA) — the risk read showed up.
The Seattle Mariners bullpen was flagged as elevated risk pregame (Tired). In relief it actually allowed 2 earned runs over 2.1 innings (7.71 ERA) — the risk read showed up. Note: 1 of the runs charged to the Seattle Mariners pitching staff overall was unearned — not something the bullpen's stuff should be blamed for.
Seattle Mariners scored 2, 2.4 fewer than the 4.4 pregame projection.
Likely driver: the opposing starter (0.00 ERA) was sharp when the read expected an edge the other way, and the Seattle Mariners bullpen allowed 2 earned runs over 2.1 relief innings (7.71 ERA), which is exactly the risk flagged pregame.
Game information
| Matchup | Athletics at Seattle Mariners |
|---|---|
| Date | Saturday, September 5, 2026 |
| First pitch | 9:40 PM ET |
| Venue | T-Mobile Park |
| Starting pitchers | Jeffrey Springs vs George Kirby |
| Weather | Game-time forecast: 66°F, 3% precipitation chance, 2 mph wind from NW. This venue has a roof, but the roof status is not confirmed. |
Starting pitcher matchup
Full Pitcher Matchup Tool →| Metric | Athletics | Mariners |
|---|---|---|
| Pitching plan | Traditional starter | Traditional starter |
| Expected innings | 5 | 6 |
| Throws | L | R |
| Leo pitcher score (higher is better) | 43 | 62 |
| ERA (lower is better) | 6.37 | 4.19 |
| WHIP (lower is better) | 1.50 | 1.35 |
| K/9 (higher is better) | 7.2 | 7.5 |
| K-BB% (higher is better) | 8.8% | 14.4% |
| K% (higher is better) | 17.9% | 20.0% |
| BB% (lower is better) | 9.1% | 5.6% |
| BB/9 (lower is better) | 3.7 | 2.1 |
| HR/9 (lower is better) | 2.4 | 1.1 |
| Ground-ball rate | 39.9% | 46.9% |
| Fly-ball rate | 60.1% | 53.1% |
Pitcher edge: Leo gives George Kirby a 19-point edge over Jeffrey Springs, driven mainly by HR/9 (1.12 vs 2.41) and ERA (4.19 vs 6.37).
How to read this: the scorecards above name the starters; every number lives in this table.
Strikeout Projections Full strikeout projections →
Same data source as the Pitcher Matchup Tool, where every starter on the slate is compared side by side.
Recent form
Full Stats page →Athletics are 5-5 in their last 10 and averaging 4.9 runs per game over the last 15 days; Mariners are 3-7 in their last 10 and averaging 4.6 runs per game over the last 15 days. On the season Mariners carry the better run differential per game (-0.51 against -1.30).
| Metric | Athletics | Mariners |
|---|---|---|
| Last 10 | 5-5 | 3-7 |
| Last 10 by venue (away team on the road, home team at home) | 6-4 on the road | 4-6 at home |
| OPS, last 15 days | 0.802 | 0.705 |
| wOBA, last 15 days (hot/cold read) | 0.353 | 0.315 |
| Runs per game, last 15 days | 4.9 | 4.6 |
| K% last 15 days (lower is better) | 23.8% | 24.9% |
Last 15 days only. Hot and cold streaks for all 30 teams live on the Stats page.
30-day offense
Full offense tool →| Last 30 days | Athletics | Mariners |
|---|---|---|
| OPS | 0.763 (+0.035 vs szn) | 0.679 (-0.007 vs szn) |
| Runs per game | 4.76 (+0.346 vs szn) | 3.89 (-0.072 vs szn) |
| wOBA (model offense input) | 0.336 (+0.015 vs szn) | 0.304 |
| K% (lower is better) | 21.6% (-0.9% vs szn) | 24.9% (+1.6% vs szn) |
Over the last 30 days the Athletics have been the better offense, 0.336 wOBA to 0.304. They are running hot against their own season line (+0.015 wOBA). Mariners are striking out at 24.9% over the window — something the opposing starter can lean on.
Season profile
Full Stats page →| Metric | Athletics | Mariners |
|---|---|---|
| Record | 56-86 | 66-76 |
| Run differential / game (team quality) | -1.30 | -0.51 |
| Runs scored / game (offense, season) | 4.41 | 3.97 |
| Runs allowed / game (defense, season, lower better) | 5.71 | 4.48 |
| Season OPS | 0.727 | 0.687 |
| K% season (lower is better) | 22.5% | 23.3% |
| OPS vs opposing hand (season) | 0.728 | 0.634 |
Season-long team quality, not recent form. Run differential and run environment come from the season standings; splits for all 30 teams live on the Stats page, including the run environment table.
The Map
Full interactive map →Every team on today's slate, on any two axes you pick. Athletics and Mariners are highlighted.
Bullpen matchup
Full Bullpen Fatigue Index →Risk is what the model actually uses: fatigue blended with how well the pen has pitched. High fatigue with high efficiency is a tired pen that is still getting outs.
| Metric | Athletics | Mariners |
|---|---|---|
| Fatigue | 8.8/10, High risk | 7.0/10, Tired |
| Efficiency | 5.7/10, Effective | 3.3/10, Below average |
| Combined risk | 8.5/10, High risk | 7.9/10, Tired |
| Relief innings, last 7 days | 33.0 | 26.7 |
| Back-to-back arms | 5 | 5 |
| 7-day ERA | 3.27 | 6.07 |
| 7-day WHIP | 1.21 | 1.69 |
Fatigue measures workload. Efficiency measures recent run prevention. Combined risk is what the moneyline and totals systems use.
Run total projection
Full Totals Projections →The model projects 3.8 runs above the market total. A research lean still requires a setup rating of at least 7.0/10. Team totals remain research-only until their graded sample is established.
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