Polymarket tennis odds swing again with no volume or size disclosed
Polymarket's odds for two tennis matches swung sharply without cited volume or trade size. For the Monterrey Open matchup between Nikola Bartunkova and Elise Mertens, a Binance post noted a sharp move but gave no magnitude, pre-move price, or current implied probability. Separately, the U.S. Open WTA submarket for Emma Navarro versus Lois Boisson saw its Over 2.5 total games option jump to 50%. Polymarket also lists $58,000 in active markets on ATP player Vardan Manukyan.
Sharp price moves without cited volume make it impossible for traders to distinguish information-driven repricing from a single large order hitting a thin book. That uncertainty raises execution risk for anyone entering at the new level. The pattern now spans multiple sports: tennis joins baseball as markets where Polymarket shows concentrated flow rather than balanced depth.
Retail traders bear the slippage, while larger players can time entries around suspected whale orders. Kalshi and Novig can exploit this in pitch materials if their own books prove tighter. Serious market makers will demand evidence of committed two-sided liquidity before building positions. Each unexplained swing costs the platform credibility with institutions. The fix is market-making capital, not more sports listings.