Analytics
“US Open WTA: Kimberly Birrell vs Petra Marcinko” is a prediction market on Polymarket with two tradeable outcomes, Yes and No. The Yes price is the crowd's implied probability that the question resolves Yes; every trade on the public order book moves it.
The venue reports this market as closed. Its scheduled close is Sep 6, 2026. No resolved outcome is inferred from a closed or suspended state.
Vultax observes this market from Polymarket's public order book and data API and keeps its own record: 3 hourly price points from Aug 29, 2026 to Aug 31, 2026 (Yes between 10.5% and 54.0%); 108 loaded holder wallets, the largest ten holding 91.8% of the loaded shares; 500 recent public fills from 192 wallets. Each figure carries its observation time; nothing here is a return forecast.
Public Polymarket market/event context is available; Vultax source-pack coverage is tracked separately.
This resolved market has no live orderbook depth; the public close quote is shown for context.
Nine stops, one per figure on this page. Each stop says what the number is, why it matters, and what it reads right now for this market.
Each outcome trades as a share that pays $1 if it wins and nothing if it loses. Prices are quoted in cents, and Yes plus No add up to about one dollar.
This market refers to the tennis match between Kimberly Birrell and Petra Marcinko in the US Open WTA, originally scheduled for August 30, 2026 at 11:00AM ET. This market will resolve to 'Kimberly Birrell' if Kimberly Birrell advances against Petra Marcinko. This market will resolve to 'Petra Marcinko' if Petra Marcinko advances against Kimberly Birrell. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 13, 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.
Official listing: polymarket.com/event/wta-birrell-marcink-2026-08-30
The Yes price read as a chance. A share at 21.5¢ means the crowd gives Yes about a 21.5% chance right now. It moves with every trade, so it is a live forecast, not a verdict.
Dollar value of shares that changed hands in the last 24 hours. High volume means the price is being tested by real money; low volume means a few trades can move it.
Dollars resting in the order book, waiting to be traded against. Deep liquidity lets a large order fill near the quoted price; thin liquidity means the price jumps when someone trades size.
The gap between the best bid and the best ask. A tight spread makes entry and exit cheap; a wide spread is a cost paid on every round trip.
The wallets holding the most shares on each side, and how much of the loaded sample the largest ten control. Concentration shows whether a market is a crowd or a handful of large positions.
The public fills, newest first: which wallet bought or sold which outcome, at what price, and when. It is the market's own diary, and every wallet on it links to a trader profile.
Hourly closes of the Yes price. The range shows how sure or split the crowd has been; the move shows which way it has been changing its mind.
Trading stops at the close time. The outcome is then settled by the resolution source named in the rules. A closed market is not resolved until the venue reports it, so the two states are shown separately.
| Petra Marcinko |
| 35.76K |
| JAMJAMJAM4 | Petra Marcinko | 11.65K |
| flatbarrel | Petra Marcinko | 2.24K |
| RebornAthena | Petra Marcinko | 2.16K |
| kitopesivan | Petra Marcinko | 1.79K |
| Repro50 | Petra Marcinko | 800 |
| 03- | Petra Marcinko | 752.03 |
| KNPDTRAD | Petra Marcinko | 741.17 |
| Substantial-Service | Petra Marcinko | 653.03 |
| Shonv1111 | Petra Marcinko | 447.86 |