---
title: "Naomi Osaka vs Elise Mertens"
canonical_url: https://betcrypto.now/events/naomi-osaka-vs-elise-mertens-polymarket-us-e01d99d4
status: settled
kickoff_at: 2026-09-04T15:00:00+00:00
trading_closes_at: 2026-09-11T15:00:00+00:00
settled_at: 2026-09-06T02:26:18+00:00
total_volume_usd: 983079.49
venues: ["Kalshi", "Polymarket", "Polymarket US"]
categories: ["Sports", "Tennis"]
prices_as_of: 2026-10-09T09:12:20+00:00
publisher: BetCrypto
data_api: https://betcrypto.now/api/v1/events/naomi-osaka-vs-elise-mertens-polymarket-us-e01d99d4
---

# Naomi Osaka vs Elise Mertens

Settled · kickoff 2026-09-04 15:00 UTC · $983,079 traded · listed on Kalshi, Polymarket, Polymarket US

## Result

**Naomi Osaka** won. Settled 2026-09-06.

## About

This market refers to the tennis match between Naomi Osaka and Elise Mertens in the US Open WTA, originally scheduled for September 4, 2026 at 11:00AM ET.

This market will resolve to 'Naomi Osaka' if Naomi Osaka advances against Elise Mertens.

This market will resolve to 'Elise Mertens' if Elise Mertens advances against Naomi Osaka.

If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 18, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve to 50-50.

If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances.

If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50.

The primary resolution source will be official information from the WTA Tour. A consensus of credible reporting may also be used.

_From Polymarket's listing._

## Other markets

- Total Games — 3 outcomes
- Elise Mertens by over 1.5 sets — 2 outcomes
- Total O/U 17.5 — 2 outcomes
- Naomi Osaka by over 1.5 sets — 2 outcomes
- Osaka wins 2-0 — 2 outcomes
- Over 2.5 sets — 2 outcomes
- Spread 1.5 — 2 outcomes
- Spread -1.5 — 2 outcomes
- Spread -4.5 — 4 outcomes
- Total O/U 22.5 — 2 outcomes
- Spread -7.5 — 2 outcomes
- Spread 4.5 — 2 outcomes
- Spread 7.5 — 2 outcomes
- Mertens wins 2-0 — 2 outcomes
- Mertens wins 2-1 — 2 outcomes
- Osaka wins 2-1 — 2 outcomes
- Set 1 Winner — 2 outcomes
- Set 2 Winner — 2 outcomes
- Total O/U 27.5 — 2 outcomes
- Set 1 Winner — 2 outcomes
- Exact Match Score — 4 outcomes
- Total O/U 20.5 — 2 outcomes
- Spread -3.5 — 2 outcomes
- Total O/U 25.5 — 2 outcomes
- Total O/U 15.5 — 2 outcomes
- Spread -0.5 — 2 outcomes
- Spread -6.5 — 2 outcomes
- Spread 0.5 — 2 outcomes
- Spread 3.5 — 2 outcomes
- Spread 6.5 — 2 outcomes
- Total O/U 16.5 — 2 outcomes
- Total O/U 26.5 — 2 outcomes
- Completed Match — 2 outcomes
- US Open WTA: Naomi Osaka vs Elise Mertens Set 2 Winner — 2 outcomes
- US Open WTA: Naomi Osaka vs Elise Mertens Set 1 O/U 8.5 — 2 outcomes
- US Open WTA: Naomi Osaka vs Elise Mertens Total Sets: O/U 2.5 — 2 outcomes
- Total O/U 21.5 — 2 outcomes
- US Open WTA: Naomi Osaka vs Elise Mertens Set 1 Winner — 2 outcomes
- US Open WTA: Naomi Osaka vs Elise Mertens Set 2 O/U 8.5 — 2 outcomes
- US Open WTA: Naomi Osaka vs Elise Mertens Set 1 O/U 9.5 — 2 outcomes
- … and 5 more

_Every market's prices are on the event page._

## Open on a venue

- [Kalshi](https://betcrypto.now/go/e/437623?via=md)
- [Polymarket](https://betcrypto.now/go/e/431072?via=md)
- [Polymarket US](https://betcrypto.now/go/e/429330?via=md)

---

Probability is the cross-venue consensus (book midpoints, 0–100%). Venue columns are what buying costs there (the ask). Prices move constantly; re-check at the canonical URL or https://betcrypto.now/api/v1/events/naomi-osaka-vs-elise-mertens-polymarket-us-e01d99d4.

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