MLB closing-line track record
How Pinnacle's closing prices fared against 831 finished MLB matches, 2026-06-15 to 2026-09-30. Updated 2026-09-30.
Pinnacle's closing favourite won 55.8% of the time, against the 57.3% its closing price implied on average. The closing line's mean Brier score (0.490) and the opening line's (0.489) differ by 0.0005, within two standard errors (0.0017) of zero: on this sample the closing line is not measurably more accurate than the first price we recorded.
The closing price against the result
| Measure | What happened | What the closing price implied | 95% range of what happened |
|---|---|---|---|
| Closing favourite won | 55.8% (460 of 824) | 57.3% | 52.4%–59.2% |
| Price moved toward the result | 50.8% (422 of 831) | — | — |
Calibration by closing probability
| Closing implied probability | Outcomes | Mean implied | Happened | 95% range |
|---|---|---|---|---|
| 0–20% | 0 | — | — | — |
| 20–40% | 225 | 35.5% | 37.8% (85) | 31.7%–44.3% |
| 40–60% | 1212 | 50.0% | 50.0% (606) | 47.2%–52.8% |
| 60–80% | 225 | 64.5% | 62.2% (140) | 55.7%–68.3% |
| 80–100% | 0 | — | — | — |
Did the closing line beat the opening line?
The closing line's mean Brier score (0.490) and the opening line's (0.489) differ by 0.0005, within two standard errors (0.0017) of zero: on this sample the closing line is not measurably more accurate than the first price we recorded.
| Per match | Matches | Share |
|---|---|---|
| Closing line scored better | 422 | 50.8% |
| Opening line scored better | 407 | 49.0% |
| Price never moved | 2 | 0.2% |
| Moved toward the result | 422 | 50.8% |
| Moved away from the result | 407 | 49.0% |
Of the 829 matches whose price moved, 50.9% moved toward what happened.
Biggest upsets
- Colorado Rockies 4-3 Los Angeles Dodgers — Colorado Rockies closed at 3.66 (26.7% implied), 2026-07-08
- St. Louis Cardinals 8-5 Los Angeles Dodgers — St. Louis Cardinals closed at 3.49 (28.0% implied), 2026-09-03
- St. Louis Cardinals 2-1 Los Angeles Dodgers — St. Louis Cardinals closed at 3.46 (28.3% implied), 2026-09-04
- Baltimore Orioles 3-2 Los Angeles Dodgers — Baltimore Orioles closed at 3.39 (28.8% implied), 2026-06-21
- St. Louis Cardinals 6-5 Philadelphia Phillies — St. Louis Cardinals closed at 3.34 (29.3% implied), 2026-08-21
- Athletics 7-3 Boston Red Sox — Athletics closed at 3.32 (29.4% implied), 2026-08-08
- Colorado Rockies 5-2 Milwaukee Brewers — Colorado Rockies closed at 3.32 (29.5% implied), 2026-07-24
- Colorado Rockies 1-0 Los Angeles Dodgers — Colorado Rockies closed at 3.15 (31.0% implied), 2026-07-07
- Colorado Rockies 9-3 Chicago White Sox — Colorado Rockies closed at 3.14 (31.1% implied), 2026-09-26
- Cincinnati Reds 7-6 Atlanta Braves — Cincinnati Reds closed at 3.05 (32.1% implied), 2026-09-24
More MLB
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How these numbers are computed
Data window. Every MLB final that kicked off in the 365 days before 2026-09-30; the matches that qualified run from 2026-06-15 to 2026-09-30. The study is recomputed once a day.
Which finals count. A football final is counted only when the last clock reading we recorded reached minute 89, the collector's evidence that full time was played; finals in other sports must pass the site's plausibility checks (no tied final in a sport that cannot end level). A final must also be the one the site publishes at its own result page, under the competition it belongs to. 869 finals qualified.
Where the prices come from. Our archive records the two bookmakers as separate events, and only one of them carries the score. Each final is paired with the Pinnacle event for the same match. First by name: the same two teams (names normalised the way the live odds board merges the two books) on the same UTC date, with kickoff times no more than 30 minutes apart. Where no name matches exactly, by the odds board's own test for one game listed twice, among Pinnacle events filed under the same competition: the same sport and competition class, both sides recognisably the same teams, kickoffs no more than 15 minutes apart — and when Pinnacle lists the fixture the other way round, its prices are put back on the right teams. A final with two equally close candidates, a candidate whose sides cannot be told apart, or a Pinnacle event claimed by two finals is left out rather than guessed. 831 of the 869 finals found their Pinnacle event, 3 of them by the second test.
Opening and closing prices. The price is Pinnacle's full-time moneyline (1X2 where the sport can end level, home/away where it cannot). The closing price is the last one we recorded at or before kickoff; the opening price is the first one we recorded — not necessarily the first price Pinnacle posted, because our collector records a market from the moment it first sees it. The median match was first priced 21.5 hours before kickoff. A match counts only when every outcome has both an opening and a closing price: 831 did.
Removing the margin.Each outcome's probability is its inverse price divided by the sum of the inverse prices of all outcomes (proportional normalisation), so the probabilities of one match add up to 100%.
The measures. The favourite is the outcome with the highest closing probability; a match where two outcomes tie for highest has no favourite. The draw row covers only sports that can end level. The calibration table places every outcome of every match in a band by its closing probability — lower bound included — and counts how often outcomes in that band happened. The Brier score of a match is the sum, over its outcomes, of the squared gap between the probability and what happened (1 for the outcome that occurred, 0 otherwise); 0 is a perfect forecast. The opening and closing scores are compared match by match, and a difference is called real only when it exceeds twice its standard error. "Moved toward the result" means the probability of what actually happened — the winner, or the draw — was higher at the close than at the open. The 10 biggest upsets are the winning teams with the lowest closing probability; each links its result page. The 95% ranges are Wilson score intervals.
Publication floor. A competition's numbers appear once 30 matches qualify; below that the page states what the archive holds and stays out of search results.
Window: 365 days. Pairing tolerance: 30 minutes by name, 15 by the second test. Pinnacle events examined: 38570. The companion study, bookmaker margins by league, measures what each book charges; this one measures how right the sharper book's last price was.