# Will Jannik Sinner win a Tennis Grand Slam in 2026

> Liquidity-weighted aggregate at 5% across 4 contracts — refreshed 40 min ago.

URL: https://simplefunctions.dev/odds/atpgrandslam
Updated: 2026-07-27T07:20:51.293Z
Category: sports
Status: active
Closes: 2026-12-31

## Headline

- Probability: 5% (liquidity-weighted across 4 contracts)
- Venue: Kalshi (4 contracts)
- 24h volume: $0

## Bound contracts (4)

| Outcome | Price | 24h | Volume | Venue | Slug |
|---|---|---|---|---|---|
| Alex de Minaur | 4¢ | +2pp | $0 | kalshi | /markets/will-alex-de-minaur-win-a-tennis-grand-slam-in-202-kalshi-kxatpgrandslam-26-amin |
| Felix Auger-Aliassime | 3¢ | −31pp | $0 | kalshi | /markets/will-felix-auger-aliassime-win-a-tennis-grand-slam-kalshi-kxatpgrandslam-26-faug |
| Lorenzo Musetti | 7¢ | +5pp | $0 | kalshi | /markets/will-lorenzo-musetti-win-a-tennis-grand-slam-in-20-kalshi-kxatpgrandslam-26-lmus |
| Novak Djokovic | 5¢ | ±0 | $0 | kalshi | /markets/will-novak-djokovic-win-a-tennis-grand-slam-in-202-kalshi-kxatpgrandslam-26-ndjo |

## 30-day trajectory

| Day | Aggregate |
|---|---|
| 2026-06-27 | 8 |
| 2026-07-13 | 6 |
| 2026-07-20 | 9 |
| 2026-07-25 | 5 |

_23 days of price history captured. Each row is the daily mean of intraday 5-min captures._

## What moved the line

- 2026-07-21 · Felix Auger-Aliassime +32pp 2→34¢ · kalshi
- 2026-07-24 · Felix Auger-Aliassime −31pp 34→3¢ · kalshi
- 2026-07-22 · Lorenzo Musetti +5pp 2→7¢ · kalshi
- 2026-07-20 · Novak Djokovic +5pp 4→9¢ · kalshi
- 2026-07-22 · Novak Djokovic −4pp 8→4¢ · kalshi

## Analysis

This probability estimates a 15% chance that Jannik Sinner wins at least one Grand Slam tournament in 2026. The market reflects Sinner's strong recent form—he won the Australian Open in January 2026 and holds multiple Grand Slam titles—but also acknowledges the difficulty of winning additional majors within the same calendar year. The probability is driven primarily by whether Sinner can maintain peak performance through the remaining 2026 Grand Slams (French Open, Wimbledon, US Open) while managing fatigue and competition from rivals like Novak Djokovic and other top contenders. The next major catalyst is Wimbledon in late June/July 2026, which will provide concrete evidence of Sinner's form and injury status heading into the US Open in late summer. Resolution occurs definitively on December 31, 2026, when the year concludes.

### Key factors

- Sinner won the 2026 Australian Open, establishing he is capable of Grand Slam victory this year but also raising the bar for winning a second major in the same calendar year
- The 70¢ contract price reflects moderate confidence in Sinner winning another Grand Slam in 2026, substantially higher than Djokovic (15¢) and other competitors, suggesting him as the market favorite
- Remaining 2026 Grand Slam tournaments (Wimbledon, US Open, and potentially French Open if counting remaining majors) must be played without certainty about injuries, form volatility, or tactical adjustments by competitors
- Grand Slam tournaments require eight consecutive match wins under high physical and mental stress, a demanding threshold that varies significantly across different court surfaces and tournament conditions
- Market liquidity is moderate ($104 24h volume on Sinner's contract) compared to Djokovic, indicating meaningful uncertainty rather than consensus among traders

## Methodology

Probability is **liquidity-weighted** across all bound Kalshi/Polymarket contracts: Σ(price × volume) ÷ Σ(volume). 30-day trajectory uses the daily mean of intraday 5-min captures. 24h delta = today's mean − yesterday's mean. Movement events are ≥3pp daily moves in the last 7 days.

## How to use this data

- HTML: https://simplefunctions.dev/odds/atpgrandslam
- JSON: https://simplefunctions.dev/api/public/odds?slug=atpgrandslam

## License

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