Kansas City Royals 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
Royals- Salvador PerezBatting3-5, 3 RBI
- Michael LorenzenPitching4.2 IP, 3 ER, 5 K
Mariners- Randy ArozarenaBatting2-4, 1 HR, 1 RBI
- Emerson HancockPitching6.0 IP, 5 ER, 1 K
Scoring summary
- 9Perez singled to center, Witt Jr. scored, Garcia to third.6–3
- 5Crawford singled to left, Williamson scored.5–3
- 5Williamson doubled to right, Raley scored.5–2
- 5Perez doubled to right, Pasquantino scored and Witt Jr. scored.5–1
- 2Arozarena homered to left center (396 feet).3–1
- 2Isbel grounded into fielder's choice to second, Loftin scored, Rave out at second.3–0
- 2Loftin doubled to left, Caglianone scored.2–0
- 1Garcia singled to center, India scored.1–0
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 KC +115 / SEA -135
- Pre-line forecast
- SEA 55%
- Elo + market-implied
- Elo ratings
- SEA 55%
- Ratings vs. market
- +0.1 pts
- SEA: Elo 55.3%, market 55.3%
- Fair odds
- SEA -124
- KC +124 · the forecast as odds, no margin
- Pregame projection
- KC 4.0 – 4.5 SEA
- Margin from the forecast, posted total 8.5
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 | KC | SEA | Why |
|---|---|---|---|
| Team rating | 1484 | 1515 | Elo entering the game; 1500 is league average |
| Home field | — | +18 | Worth 18 Elo in MLB |
| Starting pitchers | −10 | −22 | KC: Michael Lorenzen: team allows 0.50 more runs than with its usual starter (≈10 weighted starts) · SEA: Emerson Hancock: team allows 1.10 more runs than with its usual starter (≈10 weighted starts) |
| Elo ratings | SEA +37 Elo | SEA 55.3% | |
| Market-implied ratings | SEA 55.0% | Team strength as past closing lines priced it, same game context | |
| Pre-line forecast | SEA 55.0% | 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.
| KC | Stat | SEA |
|---|---|---|
| 30th of 303.3 | Runs scored | 4.611th of 30 |
| 3rd of 303.7 | Runs allowed | 4.420th of 30 |
| 22nd of 30−0.4 | Margin | +0.215th of 30 |
| 29th of 302–8 | Last 10 | 6–47th of 30 |
| 18th of 3019–22 | Road vs home | 21–1919th of 30 |
| 14th of 301501 | Opponent Elo | 149426th of 30 |
| 23rd of 301484 | Elo rating | 151513th 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 |  KC |  SEA |
|---|---|---|
| Run line | 40–45 | 37–47 |
| Last 10 | 4–6 | 6–4 |
| Favorite | 10–27 | 15–34 |
| Underdog | 30–18 | 22–13 |
| Overs–unders | 34–51 | 48–36 |
| Overs–unders, last 10 | 3–7 | 8–2 |
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
KC 4–10 SEA in their last 14 meetings; the forecast called 9 of 14.