Jannik Sinner holds the shortest price for the 2026 US Open men’s singles title at Pinnacle, but the sportsbook and a $7 million prediction market disagree sharply over who ranks second — and the draw has not been made.
Sinner is priced at -138 (1.72 decimal) to win the 2026 US Open men’s singles at Pinnacle as of August 18, 2026. American odds of -138 mean a $138 stake returns $100 in profit; the decimal 1.72 is the total return per unit staked, implying roughly 58% before margin. The main draw at the USTA Billie Jean King National Tennis Center has not been made, so every number on the board is an outright — and the two biggest markets disagree behind the favourite.
Key Facts:
• Pinnacle prices Sinner -138 (1.72), Carlos Alcaraz +226 (3.26), Alexander Zverev +558 (6.58) and Novak Djokovic +1006 (11.06), as of August 18, 2026 — Pinnacle
• Polymarket’s men’s winner market has turned over $7.03 million with $1.46 million of resting liquidity, and ranks Zverev second at 15.95 cents, ahead of Alcaraz at 12.5 cents — Polymarket
• Zverev’s contract rose from 7.4 cents on August 4 to 16 cents on August 18; Alcaraz halved from 22.5 cents to 11 cents on August 5 — Polymarket
• Fan Week runs August 23 to 29, 2026, main-draw play from August 30, men’s final September 13 — usopen.org
Where the sportsbook and the exchange disagree
Pinnacle’s 37-runner board carries an overround of about 166%, normal for a 128-player outright. Stripping that margin leaves Sinner near 35%, Alcaraz 18.5% and Zverev 9.2%. Polymarket, whose contracts sum to roughly 100%, has Sinner 40.5%, Zverev 15.95% and Alcaraz 12.5%.
The two sources therefore invert the placings behind Sinner. Pinnacle still lists the defending champion second; the exchange has moved him third, six points below the German. He is also absent from Pinnacle’s 17-runner Cincinnati field, sidelined since the April wrist injury that shaped the July US Open market.
The draw is pending — and one official feed misleads
No men’s singles draw exists yet. The official US Open site remains in pre-tournament mode: its lead news item on August 18 was an internal test article, and its 2026 men’s singles feed still returns the completed 2025 bracket, scorelines included. Any “result” attributed to the 2026 draw this week describes a round that cannot have been played.
Hard-court ratings before Flushing Meadows
Tennis Abstract’s hard-court Elo, updated August 10, 2026, ranks Sinner first on 2259.3, Alcaraz second on 2073.3, Zverev third on 2033.5, Ben Shelton fourth on 1971.9 and Daniil Medvedev fifth on 1944.0. Rafael Jodar, 19, sits sixth on 1939.9, a career high, while ranked ATP No. 11.
Zverev is also the favourite at +220 (3.20) on Pinnacle’s reshaped Cincinnati market, a field missing both Sinner and Alcaraz.
Betting Outlook
Favourite: Sinner at -138 American (1.72 decimal) at Pinnacle, where the outright closes at 15:00 UTC on August 31, 2026. His hard-court Elo lead of 186 points is the largest gap in the top five.
Model call: on hard-court Elo alone, Sinner is the modal champion and a Sinner–Zverev final the most likely pairing. Both markets agree on the favourite; only the runner-up slot is contested.
What the numbers flag:
- Zverev at +558 (6.58) — Pinnacle’s margin-adjusted 9.2% sits well below the exchange’s 15.95%, the widest split on the board.
- Alcaraz at +226 (3.26) — the same comparison runs the other way, and his entry is unconfirmed until the acceptance list appears.
- Jodar at +2001 (21.01) — sixth on hard-court Elo but 11th on the ATP list, a gap both markets price cautiously.
Where the market looks stretched: Sinner’s raw 57.98% overstates his true probability by more than 20 points once the 166% overround is removed. Pre-draw prices also carry withdrawal risk neither market can settle.
Odds correct as of August 18, 2026. Informational only — not betting or financial advice. 18+ / 21+ depending on jurisdiction. See Responsible Gambling notice below.
FAQ
Q: When is the 2026 US Open men’s singles draw made?
A: It follows Fan Week, which ends August 29, with main-draw play from August 30. No bracket existed on August 18.
Q: Why do the two markets rank the second favourite differently?
A: Pinnacle still reflects Alcaraz’s ranking and record; the exchange repriced him on August 5 and bid Zverev up from 7.4 to 16 cents.
Q: Is Carlos Alcaraz confirmed for the 2026 US Open?
A: Not from a primary source. Both boards price him as defending champion, but he is absent from Cincinnati and no entry list is public.
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