What is the Kostyuk vs Swiatek 21.5 games prediction market?

It is a Polymarket market on the National Bank Open match between Marta Kostyuk and Iga Swiatek. Traders choose whether the match will finish Over or Under 21.5 total games.

What does Over 21.5 mean in this tennis market?

The market resolves to Over if at least 22 games are completed across all sets. Tiebreaks, including Champions or Super tiebreaks, count as one game.

When is the Kostyuk vs Swiatek match scheduled?

The match was originally scheduled for August 9, 2026, at 10:00 AM Eastern Time. The market's listed resolution date is August 16, 2026, at 14:00 UTC.

What happens if the Kostyuk vs Swiatek match is not completed?

According to the market rules, if the match begins but is not completed, the market resolves 50-50.

Is smart money backing Over or Under 21.5?

The available market activity shows one recent smart-money alert favoring the Over, with $2,347 in total smart money tracked. Live share prices and implied probabilities are not included in the provided metadata.

Part of: National Bank Open: Marta Kostyuk vs Iga Swiatek

Kostyuk vs. Swiatek: Match O/U 21.5

This Polymarket tennis market tracks whether Marta Kostyuk vs Iga Swiatek will produce 22 or more total games across all sets. The match is scheduled for August 9, 2026, and the market resolves on August 16, 2026; current price odds are not included in the available metadata. One smart-money signal, representing $2,347 tracked, recently favored the Over.

1 smart money signal detected, totaling $2,347.

Categories: Tennis, Sports, Games

Notable Trades

Elite sharp buys tennis Over

A highly proven bettor with a 92% win rate and substantial edge placed a fresh, market-moving bet in a very thin tennis market.

This bettor wins 92% of 279 resolved trades and is up $837,785.
They committed $2,347 to Over at 53¢, over nine times the reported 24-hour volume.
The bet is a fresh position in a thin market with only $2,155 in liquidity, making the conviction notable.

$2,347 on Over | Wallet win rate: 92%

Top Holders

0x9f15...bdb3 — Outcome 30523279, $2,440 (71% win rate)
0x224f...514a — Outcome 30523279, $513 (84% win rate)
0xb4bf...60f8 — Outcome 30523279, $115
0x9644...d03b — Outcome 30523279, $99
0x453d...2dba — Outcome 30523279, $38
0x56cc...d589 — Outcome 30523279, $16
0x7a5d...54db — Outcome 30523279, $11 (52% win rate)
0x5c54...f1d2 — Outcome 30523279, $10
0x8d10...940a — Outcome 30523279, $10 (79% win rate)
0xb6dd...7af9 — Outcome 30523279, $9 (66% win rate)

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Kostyuk vs. Swiatek: Match O/U 21.5

7dNational Bank Open: Marta Kostyuk vs Iga Swiatek$2,347 tracked1 signalTennisSportsGames

This market refers to the tennis match between Marta Kostyuk and Iga Swiatek in the National Bank Open, originally scheduled for August 9, 2026 at 10:00AM ET. This market will resolve to "Over" if the total number of games completed across all sets equals or exceeds 22. Otherwise, it will resolve to "Under." All tiebreaks—including any Champions/Super tiebreak—count as one (1) game toward the total. If the match begins but is not completed, this market will resolve 50-50. If the match is canceled before play begins or delayed beyond 7 days from the scheduled date without a result, this market will also resolve 50-50. Resolution will be based on official WTA statistics.