Sports/POLYMARKET/May 17, 2026
polymarket market

Will Jon Rahm win the 2026 PGA Championship?

PRISM
24.0%
MARKET (PUBLISH)
17.0%
MARKET (SETTLED)
0%
MOVE
-17pp

PRISM detected 7.0pp mispricing — market held

PRISM estimated 24% against the market's 17%. This time, the market was right — a calibration data point.

PRISM MISSED-100% return
ISSUED FORECASTMay 17, 2026 at 6:08 PM
MODERATE · UNDERPRICED+7.0ppPRISM 24% · Market 17%
PRISM
24.0%
VS
MARKET
17.0%
EDGE DETECTED7.0pp
WEAK
MODERATE
STRONG
EXTREME
OUTCOME
NO
FORECAST
MODERATE
DIRECTION
UNDERPRICED
CONFIDENCE
MEDIUM
ACCURACY EDGE
-29
PUBLISHED
May 17, 2026
VIEW LIVE PRISM FORECASTSEdge scoring updated every 2h
1

What happened

This market resolved NO on May 18, 2026. The market's pricing turned out to be more accurate than PRISM's assessment.

Forecast Tape

2 events
  1. May 17, 6:08 PMPUBLISHED

    Prism 24% vs market 17% — MODERATE UNDERPRICED

  2. May 18, 4:11 AMRESOLVED NO

    Resolved NO. Market was closer than Prism on this call.

2

What the market believed

MARKET PRICE · AT FORECAST TIME
17.0%

The market was pricing this event at 17.0% probability when PRISM generated its forecast. PRISM assessed this was too low — the market was underpricing the probability.

3

What PRISM believed

PRISM PROBABILITY
24.0%
EDGE DETECTED
7.0pp
FORECAST
MODERATE UNDERPRICED
Confidence
MEDIUM
Kelly Reference
N/A
PRISM Sizing (¼ Kelly · cap 5%)
N/A
PRISM REASONING
  • Fundamental analysis indicates Jon Rahm has roughly a one-in-four chance entering the final round two strokes behind
  • Elite major pedigree, strong form, and a relatively inexperienced leader offset his current deficit
FACTORS FOR
  • +Elite major champion with proven Sunday contention performance
  • +Only two shots back with 18 holes remaining
  • +Bookmakers broadly rate him as co-favorite or near-favorite
  • +Leader lacks prior experience with 54-hole leads in big events
FACTORS AGAINST
  • Currently trailing with limited remaining holes to catch up
  • Multiple other elite contenders within a few shots
  • High inherent variance in single-round stroke-play outcomes
RESOLUTION PATHS MODELED
Rahm posts low round and wins outright in regulation18%
Rahm reaches playoff from two back and wins6%
Evidence 52%
SOURCES (7)
last day
  • PGA Championship odds: Smalley has lead, trails Rahm on ... - ESPNespn.com

    Jon Rahm is the favorite at +465, then Ludvig Åberg (+600) and Rory McIlroy (+760) trail Smalley as the only other golfers shorter than 12-1. It took a truly ...

    May 17Open →
  • 2026 PGA Championship odds, Sunday picks: Proven golf model ...sportsline.com

    Rahm and Aberg are both at +550 and McIlroy is +700. The final group tees off at 2:35 p.m. ET on Sunday. Before locking in any 2026 PGA Championship ...

    May 17Open →
  • 2026 PGA Championship picks, odds: Rory McIlroy, Jon Rahm among 9 ...cbssports.com

    T2. Jon Rahm (-4) · T2. Ludvig Åberg (-4) · T7. Rory McIlroy (-3) · T7. Xander Schauffele (-3) · T23. Scottie Scheffler (-1) · T7. Patrick Reed (-3) · T11. Chris ...

    May 17Open →
  • PGA Championship Round 4 Predictions, Picks & Oddscovers.com

    PGA Championship favorites heading into Round 4 · 1. Alex Smalley (17%, +488) · T2. Jon Rahm (15%, +566) · T2. Ludvig Aberg (12%, +733) · T7. Rory McIlroy (11%, + ...

    May 17Open →
  • 2026 PGA Championship Golf Betting: Final-Round Predictions ...vsin.com

    This championship is still wide-open, but Jon Rahm (+450) is the slight favorite, and he will be in the penultimate pairing with Nick Taylor (18/1). Taylor ...

    May 17Open →
  • 2026 PGA Championship: Who To Pick to Win the Wanamaker?pgachampionship.com

    Our favorite on the odds board is two strokes back, Jon Rahm (+465). Smalley ... A simple, outright card, and one prop bet to play during the final round of the ...

    May 17Open →
  • Alex Smalley Leads PGA Championship Leaderboard as ...heavy.com

    “Scheffler leads the PGA this season with a fourth-round scoring average of 67.22,” the model noted. Sunday's updated betting odds included: Alex Smalley +480

    May 17Open →

PRISM RETRIEVES EVIDENCE FROM A CURATED LIST OF PRIMARY WIRES + OFFICIAL SOURCES

4

Why the gap existed

Prism's 7.0% edge call was wrong — market was right

CALIBRATION SCORECARD
PRISM ACCURACY
0.058
MARKET ACCURACY
0.029
EDGE
-28.9
Brier edge
The market's probability estimate was more accurate than PRISM's on this call.
5

How this forecast played out

1.PRISM analyzed Will Jon Rahm win the 2026 PGA Championship?, classifying it as underpriced at 17.0%.
2.Forecast classification: MODERATE UNDERPRICED — PRISM estimate 24.0% vs market 17.0%.
3.Kelly reference at forecast time: —% (¼ Kelly, capped at 5%; mathematical reference only — not a position recommendation).
4.Outcome: resolved NO.

Get live PRISM forecasts for Kalshi + Polymarket.

Edge scores, Kelly references, confidence levels, and resolution paths — updated every 2 hours, before the market corrects.

VIEW LIVE FORECASTS
PRISM: v0.9.125-fast-ledger-floor·Forecasted: May 17, 2026·Resolved: May 18, 2026·polymarket
For informational purposes only. Not financial advice. EdgeCal provides PRISM-generated market analysis and does not execute trades, manage funds, or guarantee returns. Past performance does not indicate future results.