Chicago White Sox 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
White Sox- Chase MeidrothBatting1-4, 1 RBI
- Anthony KayPitching5.1 IP, 1 ER, 5 K
Mariners- Julio RodriguezBatting1-4
- Bryce MillerPitching5.2 IP, 0 ER, 7 K
Scoring summary
- 9Benintendi reached on infield single to second, Vargas scored, Meidroth to third.2–1
- 9Meidroth singled to right, Hill scored, Meidroth to second, Vargas to third.1–1
- 1Wisdom grounded into fielder's choice to shortstop, Rodríguez scored, Naylor out at second, Arozarena to third.0–1
The pick
Reconstructed from what was known before the game: the ratings at that point and the closing line.
Mariners 55%
Forecast Elo ratings alone
How often that comes true: MLB favorites the forecast gave 55–60% have won 55.5% of 2,596 graded games.
- Market
- SEA 55%
- ML CHW +114 / SEA -137
- Pre-line forecast
- SEA 57%
- Elo + market-implied
- Elo ratings
- SEA 59%
- Ratings vs. market
- +3.9 pts
- SEA: Elo 59.2%, market 55.3%
- Fair odds
- SEA -124
- CHW +124 · the forecast as odds, no margin
- Pregame projection
- CHW 3.8 – 4.2 SEA
- Margin from the forecast, posted total 8
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 | CHW | SEA | Why |
|---|---|---|---|
| Team rating | 1465 | 1518 | Elo entering the game; 1500 is league average |
| Home field | — | +18 | Worth 18 Elo in MLB |
| Starting pitchers | +3 | −4 | CHW: Anthony Kay: team allows 0.14 fewer runs than with its usual starter (≈5 weighted starts) · SEA: Bryce Miller: team allows 0.19 more runs than with its usual starter (≈10 weighted starts) |
| Elo ratings | SEA +64 Elo | SEA 59.2% | |
| Market-implied ratings | SEA 56.4% | Team strength as past closing lines priced it, same game context | |
| Pre-line forecast | SEA 56.8% | 15% Elo, 85% market-implied (log-odds blend) | |
| Forecast | SEA 55.3% | 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. Opponent Elo: how strong the teams each has played are, 1st the toughest.
| CHW | Stat | SEA |
|---|---|---|
| 12th of 304.5 | Runs scored | 4.222nd of 30 |
| 24th of 304.8 | Runs allowed | 3.97th of 30 |
| 19th of 30−0.3 | Margin | +0.210th of 30 |
| 3rd of 307–3 | Last 10 | 4–619th of 30 |
| 18th of 3010–13 | Road vs home | 13–1422nd of 30 |
| 21st of 301496 | Opponent Elo | 149918th of 30 |
| 27th of 301465 | Elo rating | 151810th 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 |  CHW |  SEA |
|---|---|---|
| Run line | 24–23 | 20–29 |
| Last 10 | 5–5 | 4–6 |
| Favorite | 1–7 | 16–26 |
| Underdog | 23–16 | 4–3 |
| Overs–unders | 27–19–1 | 21–25–3 |
| Overs–unders, last 10 | 7–2–1 | 4–5–1 |
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
CHW 6–17 SEA in their last 23 meetings; the forecast called 16 of 23.