Kostovic vs Zidansek

This market covered the women's singles quarterfinal between Teodora Kostovic and Tamara Zidansek at the 2026 W100 Aschaffenburg event in Germany. Kalshi's main market resolved Yes if Kostovic won the match after a ball was played, with walkovers or pre-match cancellations resolving to $0.50. Azuro additionally offered a wide range of side markets covering game handicaps, set totals, and odd/even outcomes. Kostovic was priced as the overwhelming favourite on Kalshi at 99.0%, leaving Zidansek at just 1.0%. Kalshi carried essentially all of the meaningful action, with roughly $101,865 in volume against $35,632 in liquidity, while Azuro's head-to-head market showed no volume or liquidity. Azuro's implied prices on the same match diverged sharply: Kostovic at 56.8% and Zidansek at 49.0%, which together also fail to sum cleanly to 100% and reflect an untraded, indicative quote rather than active market consensus. The cross-platform spread on Kostovic between Kalshi (99.0%) and Azuro (56.8%) is therefore roughly 42 percentage points, but with Azuro showing zero liquidity the Kalshi price is the only one backed by real flow. The takeaway: traders on the liquid venue treated Kostovic as an all-but-certain winner, while Azuro's stale quotes are not a meaningful counter-signal.