The Gap #6: the book and the crowd disagree on Krylov, Nikita vs Whittaker, Robert

Prediction markets and crypto books are miles apart on two UFC headliners this week, and one World Cup quarter-final is worth a second look.

The fights

The standout gap in this entire dataset sits on Robert Whittaker to beat Nikita Krylov on 12 July. Polymarket has Whittaker at 57.4% — a crowd fair price of 1.74 — while Roobet is still quoting 2.35, implying only 39.7%. That is a 17.7 percentage-point discrepancy: the book is pricing a coin-flip where the market sees a clear favourite. In money terms, you are being offered 2.35 on something the crowd thinks should cost 1.74. Gaps that wide are rare and worth treating seriously.

Right behind it is Benoit Saint-Denis against Paddy Pimblett, also on 12 July. The market gives Saint-Denis a 55.9% chance — fair price 1.79 — but BC.Game has him at 2.20, implying just 42.4%. That is a 13.5pp gap. Pimblett brings a vocal fanbase and genuine mainstream crossover, which has a tendency to distort book pricing on his fights; the crowd on Polymarket appears to be cutting through that noise. Two fights on the same card with gaps this size is unusual, and both deserve attention before lines tighten as the week progresses.

Kavanagh over Royval shows a 5.3pp gap at first glance, but the crowd fair price works out to 1.49 against a book price of 1.50 — that is essentially no edge in practice, and the raw percentage gap is largely vig arithmetic rather than a genuine mispricing.

The football

USA vs Belgium at the World Cup on 7 July carries the biggest football gap in this edition. Polymarket puts the USA at 37.9% to win outright — a fair price of 2.64 — while BC.Game is offering 3.20, implying only 29.1%. An 8.8pp gap on a World Cup knockout match is meaningful, particularly given that the book price of 3.20 represents real money on what the crowd considers a near-even contest. This one kicks off quickly so the window is short.

France vs Morocco on 9 July shows a 6.9pp gap in France's favour: crowd fair price 1.65, BC.Game quoting 1.72. Directionally interesting, but at those absolute odds levels a sub-7pp gap does not move the needle much in expected-value terms. It clears the threshold for a look, but it is the thinner of the two football opportunities this week.

The skips

Several markets look like they might offer something but do not hold up. Argentina vs Egypt shows a 4.8pp gap, yet the book price is 1.45 against a fair price of 1.43 — you are barely getting compensated for the margin, let alone any genuine edge. The McGregor vs Holloway line on Holloway is at exactly the 2pp threshold, and the crowd fair price of 1.51 is actually slightly above the book's 1.47, meaning the book is marginally the tighter price; call it no edge. Portugal vs Spain at 1.9pp is below our minimum and should be left alone. Du Plessis vs Usman and Gandra vs Reese both sit at 2.5pp and 2.7pp respectively — tempting on paper, but neither clears enough margin to justify confidence over noise.

Odds move between capture and kick-off, and the only price that matters is the one on the screen when you place the bet.