TOTAL VOLUME:
$134.2b
24H VOL:
$134,145,987
24H TRANSACTIONS:
2,388,728,490
OPEN INTEREST:
$1,441,166,947
406,422
Markets across
30,383
events
MATCHED EVENTS:
2,688
PLATFORM COVERAGE:
5
Polymarket:
39%
VS.
Kalshi:
61%
Closed: Sep 3, 6:50 PM EST
Polymarket
This group covers various markets related to the Naomi Osaka vs. Katerina Siniakova WTA US Open tennis match, scheduled for September 2, 2026. Markets include questions about the total games played, set winners, game spreads, and over/under lines for games in specific sets. Resolution relies primarily on official Grand Slam statistics.
This market refers to the tennis match between Naomi Osaka and Katerina Siniakova in the US Open WTA, originally scheduled for September 2, 2026 at 11:00AM ET. This market will resolve to 'Naomi Osaka' if Naomi Osaka advances against Katerina Siniakova. This market will resolve to 'Katerina Siniakova' if Katerina Siniakova 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 16, 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.
This market refers to the tennis match between Naomi Osaka and Katerina Siniakova in the WTA US Open, originally scheduled for September 2, 2026 at 15:00 UTC. This market will resolve to "YES" if the total number of games completed across all sets equals or exceeds 22. Otherwise, it will resolve to "NO." 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.
Prediction market odds, like those displayed for this market, often reflect a different kind of information than traditional sportsbook odds. Sportsbooks typically set lines to balance betting action and incorporate a profit margin, while prediction markets are driven by individuals wagering their own capital based on their beliefs about the outcome. This can lead to prediction markets being more accurate, particularly when there is significant volume. However, sportsbook odds are readily available and often easier for the general public to understand. Examining both can provide a more well-rounded view of the probabilities surrounding the Osaka vs Siniakova match.
Polymarket and Limitless can show different implied probabilities for the same outcome because of liquidity, fee structure, participant mix, and how each venue defines the contract. Prices on Polymarket and Limitless may differ due to variations in user base, market design, and trading activity. Polymarket might attract a different type of trader than Limitless, leading to differing opinions being reflected in the prices. Furthermore, the specific market structures on each platform – such as the types of contracts offered and the fees charged – can influence trading behavior. It’s also possible that information is incorporated at different rates on each platform, causing temporary discrepancies in the perceived probabilities for this market.