28% — Will Sara Errani / Lilli Tagger win the Perez / Schuurs vs Errani / Tagger Kalshi 28% · 20 contracts · $2K volume · medium confidence Updated 2026-05-28 20:44:02 UTC Why this matters: This market reflects an 8% probability that Sara Errani and Lilli Tagger will defeat Perez and Schuurs in their upcoming doubles match. The low odds suggest market participants view Errani/Tagger as significant underdogs, likely reflecting differences in player rankings, recent form, or head-to-head records. The probability could shift higher if recent tournament results or rankings indicate Errani/Tagger are performing better than expected, or lower if Perez/Schuurs demonstrate strong recent form leading into the match. The match outcome will resolve when the contest is completed, with the winner advancing and the loser eliminated from the tournament. Key factors: - Current ATP/WTA doubles rankings and recent ranking trends for all four players - Head-to-head match history between the Perez/Schuurs pairing and the Errani/Tagger pairing if available - Tournament performance and win-loss records in doubles competitions during the current season for both teams - Recent surface performance, as doubles dynamics and player comfort vary significantly by court type - Injury status or recent absences of any of the four players that might affect match preparation or fitness Contracts: - Will Katerina Siniakova / Taylor Townsend win the Siniakova / Townsend vs Arango / Jovic: Round Of 32 match?: Katerina Siniakova / Taylor Townsend — 87¢ Kalshi $643 (weight 41%) - Will Emiliana Arango / Iva Jovic win the Siniakova / Townsend vs Arango / Jovic: Round Of 32 match?: Emiliana Arango / Iva Jovic — 4¢ Kalshi $603 (weight 38%) - Will Tatjana Maria / Zeynep Sonmez win the Kalinina / Yastremska vs Maria / Sonmez: Round Of 32 match?: Tatjana Maria / Zeynep Sonmez — 29¢ Kalshi $185 (weight 12%) - Will Anhelina Kalinina / Dayana Yastremska win the Kalinina / Yastremska vs Maria / Sonmez: Round Of 32 match?: Anhelina Kalinina / Dayana Yastremska — 64¢ Kalshi $147 (weight 9%) - Will Jelena Ostapenko / Erin Routliffe win the Ostapenko / Routliffe vs Aoyama / Liang: Round Of 32 match?: Jelena Ostapenko / Erin Routliffe — 62¢ Kalshi $1 (weight 0%) - Will Gabriela Dabrowski / Luisa Stefani win the Dabrowski / Stefani vs Pridankina / Tang: Round Of 32 match?: Gabriela Dabrowski / Luisa Stefani — 76¢ Kalshi $1 (weight 0%) - Will Marie Bouzkova / Sara Sorribes Tormo win the Bouzkova / Sorribes Tormo vs Haddad Maia / Samsonova: Round Of 32 match?: Marie Bouzkova / Sara Sorribes Tormo — 4¢ Kalshi $0 (weight 0%) - Will Beatriz Haddad Maia / Liudmila Samsonova win the Bouzkova / Sorribes Tormo vs Haddad Maia / Samsonova: Round Of 32 match?: Beatriz Haddad Maia / Liudmila Samsonova — 4¢ Kalshi $0 (weight 0%) - ... and 12 more --- ## Methodology SimpleFunctions aggregates live YES-side prices from Kalshi and Polymarket contracts bound to this question. For binary topics the headline is the liquidity-weighted mid-price (weight = log(1 + 24h volume) × freshness, where freshness is 1.0 if updated <24h, 0.7 if <7d, 0.4 otherwise). For multi-outcome (winner-take-all) topics the headline is the current leader's price — disjoint outcomes are never arithmetically averaged. Snapshots refresh every 5 minutes during market hours. ## SF Signal - SF Index, regime, and 30d Brier calibration are computed separately and surfaced at https://simplefunctions.dev/admin/calibration. - No SimpleFunctions index / regime / calibration signal is bound to this topic yet — the headline above is market-derived only. --- *Last verified: 2026-05-28T20:20:07.416Z* By SimpleFunctions — https://simplefunctions.dev/ Cite as: "28% per prediction markets (SimpleFunctions, May 2026)" Canonical: https://simplefunctions.dev/answer/wtadoubles Full data: https://simplefunctions.dev/api/public/query?q=Will%20Sara%20Errani%20%2F%20Lilli%20Tagger%20win%20the%20Perez%20%2F%20Schuurs%20vs%20Errani%20%2F%20Tagger Provider: SimpleFunctions — https://simplefunctions.dev