Jannik Sinner Out: How 2026 US Open Betting Odds Shifted

Jannik Sinner's withdrawal from the 2026 US Open with a knee injury has done what no draw ceremony could: it has fundamentally rewritten the betting market at Flushing Meadows. With the main draw beginning Sunday, August 30 and the men's final scheduled for Sunday, September 13, bettors have a compressed window to reassess a tournament that suddenly looks very different.

Quick answer: Jannik Sinner withdrew from the 2026 US Open with a knee injury, leaving defending champion Carlos Alcaraz as the clear favourite at around +140 to +250 depending on the book. Alcaraz's implied probability on prediction markets fell from roughly 35% to 26% after the draw placed him in the same half as Novak Djokovic. Alexander Zverev sits second at about 20%, with Djokovic around 11%.

What the Withdrawal Actually Changes

Removing the second-best hard-court player in the world does not simply redistribute his win probability evenly. It changes the structure of the bracket.

Sinner's absence eliminates one of the two most likely finalists, which mathematically inflates the outright price of everyone else — but it disproportionately benefits the players who would have shared his half of the draw. Those competitors now face a materially softer path to the semi-finals, and their outright prices have not always adjusted enough to reflect it.

This is a recurring inefficiency in tennis markets. Books move the headline favourite's price quickly and accurately. They are slower to reprice the mid-tier players whose path improved, because path value is harder to model than raw quality.

The Alcaraz Paradox: Favourite, But Cheaper

Here is the counterintuitive part. Alcaraz became the outright favourite when Sinner withdrew, and yet his implied probability on prediction markets actually fell from roughly 35% to 26% after the draw.

The reason is the bracket. Thursday's draw placed Alcaraz in the same half as Novak Djokovic, setting up a potential semi-final between the defending champion and a 24-time major winner who has repeatedly proven he can beat anyone over five sets in New York. Zverev anchors the opposite half, meaning he can reach the final without facing either of them.

So the market is telling two stories at once: Alcaraz is more likely to win than any other individual player, and his path is harder than a naive reading of the field would suggest. Both can be true, and that tension is where betting value usually hides.

Where the Numbers Sit

• Carlos Alcaraz: approximately 26% implied on prediction markets; +140 to +250 at sportsbooks depending on the operator
• Alexander Zverev: approximately 20% implied, anchoring the top half
• Novak Djokovic: approximately 11% implied, drawn into Alcaraz's half
• Field: the remaining ~43% spread across the rest of the draw

The spread between +140 and +250 on the same player at different books is the most actionable detail in that list. That is not a small line difference — it represents a gap of roughly 13 percentage points in implied probability on an identical outcome. Anyone betting Alcaraz without shopping is leaving real money behind. Our roundup of the best sportsbook promos covers which operators are competitive on tennis pricing and where sign-up value is currently strongest.

How to Approach a Grand Slam Without the Second Favourite

1. Bet halves, not just outrights

"To reach the final" markets are frequently better priced than outrights during a disrupted draw, because they isolate path quality from the coin-flip of a single final. Zverev's route to the final is now considerably cleaner than Alcaraz's, and that asymmetry is often better expressed in a reach-the-final bet than an outright.

2. Respect the five-set variance

Best-of-five reduces upset frequency relative to best-of-three, but does not eliminate it. Grand slam favourites lose early far more often than casual bettors expect, and a 26% implied favourite still loses 74% of the time.

3. Do not chase the vacated equity blindly

When a top seed withdraws, recreational money reliably floods into the next name down the list. That is the exact moment when the fifth-to-tenth seeds are most underpriced. If you want to understand the mechanics of how public money moves lines, our betting fundamentals guide covers line movement and closing-line value.

Injury Withdrawals and the Live Betting Angle

A knee injury withdrawal before a major raises a broader point for in-play bettors: physical condition is the most under-modelled variable in tennis. Players who have recently returned from injury, or who have played a heavy summer hard-court schedule, are systematically more likely to fade in the third and fourth sets.

Live markets often price the first set heavily and adjust slowly to visible physical decline. If you are watching a match rather than just tracking a score, that is a genuine informational edge — one of the few remaining in a market this efficient.

The Prediction Market vs. Sportsbook Divide

The 2026 US Open is another case study in the widening gap between traditional sportsbook pricing and prediction market pricing. Kalshi's implied probabilities for Alcaraz moved faster and further after the draw than several sportsbook outright prices did.

For bettors, that divergence is a tool. Prediction markets often act as the sharper, faster signal, while sportsbooks carry the promotional value and the familiar bet types. Comparing the two before placing an outright is now standard practice for serious tennis bettors. Reviews of the major US operators — including our DraftKings review and FanDuel review — break down which books actually post competitive tennis lines rather than treating the sport as an afterthought.

Frequently Asked Questions

Why did Jannik Sinner withdraw from the 2026 US Open?

Sinner withdrew with a knee injury shortly before the tournament, removing one of the two clear pre-tournament favourites from the men's draw.

Who is the favourite to win the 2026 US Open?

Carlos Alcaraz is the outright favourite as defending champion, priced between +140 and +250 across sportsbooks and sitting at roughly 26% implied probability on prediction markets.

Why did Alcaraz's odds get longer if the second favourite withdrew?

The draw placed him in the same half as Novak Djokovic, creating a potential semi-final against a 24-time major champion. The harder path outweighed the benefit of Sinner's absence in the market's view.

When does the 2026 US Open finish?

The main draw begins Sunday, August 30, with the men's singles final scheduled for Sunday, September 13.

Conclusion

Sinner's withdrawal did not just remove a contender — it redistributed path value in ways the outright market has only partly priced. The sharpest angle right now is in reach-the-final and half-of-draw markets rather than headline outrights, and in shopping a line that varies by more than 100 points between books. Start with our full sports betting guide to build the line-shopping habits that turn small pricing edges into a long-term return.