Who will win a Calendar Grand Slam in 2026
Liquidity-weighted aggregate sits at 27% across 20 Kalshi contracts.
Implied probability
Kalshi
27%
20 contracts
Polymarket
—
not bound
Cross-venue gap
—
single venue
24h move
—
no pin
24h volume
$6K
20 contracts
Closes
Dec 31, 2026
241 days
30-day trend
Bracket families
17 clusters across 20 contracts.
These contracts were grouped by title similarity. The headline aggregate combines all clusters; verify the cluster you actually need before quoting a number.
Heads-up — heterogeneous clusters
The top two clusters share only 8% of their title tokens — “How many Grand Slams” vs “Will Scottie Scheffler win the grand slam before 2028”. The headline aggregate weights both, so the number on this page is meaningful only if the clusters resolve to the same question.
Cluster 1
How many Grand Slams
How many Grand Slams will Jannik Sinner win in 2026?: 3+ Grand Slam wins
KXGRANDSLAM-JSIN26-3
How many Grand Slams will Carlos Alcaraz win in 2026?: 2+ Grand Slam wins
KXGRANDSLAM-CALC26-2
How many Grand Slams will Jannik Sinner win in 2026?: 2+ Grand Slam wins
KXGRANDSLAM-JSIN26-2
How many Grand Slams will Jannik Sinner win in 2026?: 1+ Grand Slam wins
KXGRANDSLAM-JSIN26-1
Cluster 2
Will Scottie Scheffler win the grand slam before 2028
Will Scottie Scheffler win the grand slam before 2028?: Before 2028
KXSCOTTIESLAM-28
Cluster 3
Will Aryna Sabalenka win a Tennis Grand Slam in 2026
Will Aryna Sabalenka win a Tennis Grand Slam in 2026?: Aryna Sabalenka
KXWTAGRANDSLAM-26-ASAB
Cluster 4
Will any man other than Carlos Alcaraz and Jannik Sinner win any ATP Tennis Grand Slam in 2026
Cluster 5
Will Novak Djokovic win a Tennis Grand Slam in 2026
Will Novak Djokovic win a Tennis Grand Slam in 2026?: Novak Djokovic
KXATPGRANDSLAM-26-NDJO
Cluster 6
What will the announcers say during Blue Jays vs Twins Professional Baseball Game
Cluster 7
Will Amanda Anisimova win a Tennis Grand Slam in 2026
Will Amanda Anisimova win a Tennis Grand Slam in 2026?: Amanda Anisimova
KXWTAGRANDSLAM-26-AANI
Cluster 8
Will Alexander Zverev win a Tennis Grand Slam in 2026
Will Alexander Zverev win a Tennis Grand Slam in 2026?: Alexander Zverev
KXATPGRANDSLAM-26-AZEV
Cluster 9
Will Jannik Sinner win a Tennis Grand Slam in 2026
Will Jannik Sinner win a Tennis Grand Slam in 2026?: Jannik Sinner
KXATPGRANDSLAM-26-JSIN
Cluster 10
Will Mirra Andreeva win a Tennis Grand Slam in 2026
Will Mirra Andreeva win a Tennis Grand Slam in 2026?: Mirra Andreeva
KXWTAGRANDSLAM-26-MAND
Cluster 11
Will Coco Gauff win a Tennis Grand Slam in 2026
Will Coco Gauff win a Tennis Grand Slam in 2026?: Coco Gauff
KXWTAGRANDSLAM-26-CGAU
Cluster 12
Will Daniil Medvedev win a Tennis Grand Slam in 2026
Will Daniil Medvedev win a Tennis Grand Slam in 2026?: Daniil Medvedev
KXATPGRANDSLAM-26-DMED
Cluster 13
Will Karen Khachanov win a Tennis Grand Slam in 2026
Will Karen Khachanov win a Tennis Grand Slam in 2026?: Karen Khachanov
KXATPGRANDSLAM-26-KKHA
Cluster 14
Will Frances Tiafoe win a Tennis Grand Slam in 2026
Will Frances Tiafoe win a Tennis Grand Slam in 2026?: Frances Tiafoe
KXATPGRANDSLAM-26-FTIA
Cluster 15
Will Lorenzo Musetti win a Tennis Grand Slam in 2026
Will Lorenzo Musetti win a Tennis Grand Slam in 2026?: Lorenzo Musetti
KXATPGRANDSLAM-26-LMUS
Cluster 16
Will Jack Draper win a Tennis Grand Slam in 2026
Will Jack Draper win a Tennis Grand Slam in 2026?: Jack Draper
KXATPGRANDSLAM-26-JDRA
Cluster 17
Will Casper Ruud win a Tennis Grand Slam in 2026
Will Casper Ruud win a Tennis Grand Slam in 2026?: Casper Ruud
KXATPGRANDSLAM-26-CRUU
What moved the line
- May 1Grand Slam↑17pp4→21¢ · Kalshi
- Apr 263+ Grand Slam wins↑8pp17→25¢ · Kalshi
- May 2Grand Slam↑8pp21→29¢ · Kalshi
- Apr 282+ Grand Slam wins↓6pp41→35¢ · Kalshi
- Apr 302+ Grand Slam wins↓4pp36→32¢ · Kalshi
Recently closed in general
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These markets stopped trading. Last odds and any captured outcome are shown above — full settlement detail lives at the venue.
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In general
How we compute these odds
SimpleFunctions aggregates live prediction-market contracts from Kalshi and Polymarket. Each slug groups contracts that resolve on the same underlying event, identified by venue event_id.
For binary slugs, the headline probability is the liquidity-weighted mid-price across all bound contracts. For multi-outcome slugs (e.g. elections with 3+ candidates), the headline is the leader’s price; we never arithmetically average disjoint outcomes — that would produce a number with no real-world meaning.
Snapshots refresh every 5 minutes during market hours; daily aggregates are computed at 04:00 UTC. The 30-day sparkline is drawn from per-ticker daily means stored in market_indicator_daily; 24h delta and movement events are derived from the same source.
Last updated on this page: 40 min ago.