Houston Astros at Seattle Mariners, MLB forecast
Win probability
Starts from the pregame forecast, then moves with the score and the time left after each inning. Above the line favors SEA.
Game center
From the ESPN box score.
Top performers
Astros- Yainer DiazBatting1-3, 2 RBI
- Hunter BrownPitching6.0 IP, 0 ER, 5 K
Mariners- Victor RoblesBatting2-3
- Luis CastilloPitching7.0 IP, 3 ER, 3 K
Scoring summary
- 3Diaz singled to right, Altuve scored and Bregman scored, Alvarez to second.3–0
- 3Pitch 1 : Ball In Play3–0
- 3Altuve reached on bunt single to third, Cabbage scored on throwing error by third baseman Rojas.1–0
- 3Pitch 1 : Ball In Play1–0
The pick
Reconstructed from what was known before the game: the ratings at that point and the closing line.
Mariners 51%
Forecast Elo ratings alone
How often that comes true: MLB favorites the forecast gave 50–55% have won 52.7% of 2,871 graded games.
- Market
- SEA 51%
- ML HOU -105 / SEA -115
- Pre-line forecast
- SEA 52%
- Elo + market-implied
- Elo ratings
- SEA 51%
- Ratings vs. market
- −0.5 pts
- SEA: Elo 50.5%, market 51.1%
- Fair odds
- SEA -104
- HOU +104 · the forecast as odds, no margin
- Pregame projection
- HOU 3.7 – 3.8 SEA
- Margin from the forecast, posted total 7.5
How the number is built
Elo inputs in rating points (higher favors that team; 25–28 Elo is about a point of spread in football and basketball), then how the pieces combine.
| Factor | HOU | SEA | Why |
|---|---|---|---|
| Team rating | 1535 | 1520 | Elo entering the game; 1500 is league average |
| Home field | — | +18 | Worth 18 Elo in MLB |
| Starting pitchers | 0 | 0 | HOU: Hunter Brown: team allows 0.01 more runs than with its usual starter (≈10 weighted starts) · SEA: Luis Castillo: team allows 0.01 fewer runs than with its usual starter (≈10 weighted starts) |
| Elo ratings | SEA +4 Elo | SEA 50.5% | |
| Market-implied ratings | SEA 52.6% | Team strength as past closing lines priced it, same game context | |
| Pre-line forecast | SEA 52.3% | 15% Elo, 85% market-implied (log-odds blend) | |
| Forecast | SEA 51.1% | Follows the market (vig removed): in testing, adding the ratings made it less accurate | |
Tale of the tape
This season coming into the game, regular season, each number with its league rank (the longer the bar, the higher). Home and road: the host's record at home against the visitor's on the road.
| HOU | Stat | SEA |
|---|---|---|
| 10th of 304.8 | Runs scored | 3.928th of 30 |
| 12th of 304.3 | Runs allowed | 3.72nd of 30 |
| 9th of 30+0.5 | Margin | +0.214th of 30 |
| 7th of 306–4 | Last 10 | 5–511th of 30 |
| 20th of 3020–25 | Road vs home | 30–186th of 30 |
Rating history
Each team's Elo over the last two seasons. Hover or drag to compare on any date.
Recent form
Last five results, and whether the forecast hit.
Against the line
How each team has done against the closing spread and total, coming into this game.
| This season |  HOU |  SEA |
|---|---|---|
| Run line | 49–44 | 41–56 |
| Last 10 | 7–3 | 4–6 |
| Favorite | 31–35 | 23–41 |
| Underdog | 18–9 | 18–15 |
| Overs–unders | 39–51–3 | 40–55–2 |
| Overs–unders, last 10 | 5–5 | 6–4 |
Against each game's closing line. Books set every line knowing these records: across 3,901 past games, the team with the better record against the spread so far that season covered 51.2%, short of the 52.4% a standard −110 bet needs, and over/under streaks held 48.0% of the time. They describe the past.
Head to head
HOU 6–14 SEA in their last 20 meetings; the forecast called 6 of 20.