The KBO King is a research tool for KBO player props. We project a realistic number for every player on the slate, compare it to the posted line, and surface the spots where the two disagree the most. Here's the whole approach, in plain English.
For each player and each stat, we estimate what we actually expect to happen tonight — not a guess, but a number grounded in recent form, the matchup, the role, and the conditions of the game. That projection is the foundation for everything else.
Every prop comes with a line. We show our projection and the model's win probability beside it and leave the comparison to you. We used to publish the gap as an edge and sort it into Elite / Strong / Lean / Pass tiers; we no longer do.
We graded them. Since our inputs were repaired on 2026-07-28 the board is 51.6% — 723-679 on the 1,402 picks that were decided, plus 97 pushed, over 34 slates. Across every slate we have graded, the degraded period before that date included, it is 51.5% — 962-905 on 1,867 decided, plus 123 pushed, out of 1,990 picks graded in all, over 75 slates. The count and the rate do not share a denominator: a push sits inside the graded total and outside the hit rate. Both figures are below the ~54% break-even of the -119 leg the grader prices, and below the 57.7% a two-pick entry has to clear. The three tiers we used to surface — Elite, Strong and Lean — were retired on 2026-07-27. On the record as it stood that day all three sat below the ~54% break-even and all three were negative on units, and taken together they were 53.2% (413-364) with a slate-clustered 95% interval of [48.7%, 57.8%], which contains “no edge” comfortably. Those are the numbers of 2026-07-27, kept here as the reason for the decision and deliberately not restated as a current figure — the current figures are the ones above, and they are derived, not typed. A tier that cannot be shown to work is not a conviction, so we stopped printing one.
Worth knowing how the ledger is built: the nightly grader re-derives every result from the full snapshot history, and it keeps every one of them. What it publishes is the most recent 300 rows, so the row-by-row ledger you can inspect is a rolling window that does not accumulate. The totals quoted above are computed over the whole graded history, not over that window — which is why the counts above are larger than the table below. What you can check row by row is what there is.
We used to assemble the day's multi-pick combinations here. We do not any more. A slip asserts four things at once — a win probability, a payout multiple, an EV% and a stake — and over its own graded record this board's probability could not be told apart from a flat prior, so not one of the four was supportable. The slip builder is off; it is not having a quiet day. Projections and posted lines on the board are unchanged.
Once games finish, every pick we posted is graded — win, loss, or push — and added to our track record. You can see our hit rate over time. Nothing is deleted after the fact from the ledger we grade against — but be clear about what you can see: the public track record is a rolling 300-row window of that ledger, not all of it.
See our model accuracy → — the reliability curve and Brier score proving our published probabilities match real-world frequencies. Calibration, not a betting record.
No — and we do not claim to beat the price. Player props are inherently uncertain, our projections are often wrong, and the graded record on this site does not clear the pick’em break-even. Treat everything here as research, which is exactly why we publish the whole track record.
The board refreshes through the day as lines and information move, so the projections you see reflect the latest available picture before first pitch.
Power slips pay more but every leg must hit; Flex slips pay less per win but still return something if one leg misses. We no longer build either. Slips were retired on 2026-07-28 — see step 4 above. This entry is kept so the question has an answer, not because the product exists.
We do not recommend a stake. Only ever risk money you can afford to lose. This is an information tool, not financial advice.
The KBO King is for entertainment and informational purposes only. 21+. If gambling is no longer fun, it's time to stop — please play responsibly.