TOTAL VOLUME:

$134.1b

24H VOL:

$133,388,117

24H TRANSACTIONS:

2,388,728,490

OPEN INTEREST:

$1,436,095,462

405,232

Markets across

30,526

events

MATCHED EVENTS:

2,693

PLATFORM COVERAGE:

5

Polymarket:

39%

VS.

Kalshi:

61%

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Monterrey Open: Yulia Starodubtseva vs Elise Mertens
polymarket
kalshi

Monterrey Open: Yulia Starodubtseva vs Elise Mertens

Volume:
$1,667,840

Elise Mertens

all

2 markets

Kalshi

Polymarket

consensus

News

Positive

Negative

Neutral

Hover marker for details

Vol.

·

Resolved Aug 28, 2026

Closed: Sep 1, 6:25 PM EST

kalshi

Kalshi

View
Join Kalshi and score $25 for your first trade.
Outcome
Trade
Chance %
Price
Spread
Liquidity
Volume
24h
7d
Open Interest
Ends in
Result
kalshi

Elise Mertens

View
100%
15%
Yes 100¢No 0¢
100¢
N/A
$587,372
N/A
N/A
$324,694
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens

View
0%
36%
Yes 0¢No 100¢
—
N/A
$189,045
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set Handicap +/-1.5

View
100%
1%
Yes 100¢No 0¢
0.1¢
N/A
$10,064
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Game Spread +/-3.5

View
100%
1%
Yes 100¢No 0¢
0.1¢
N/A
$9,713
N/A
N/A
N/A
Settled
Yes
polymarket

Completed Match

View
100%
1%
Yes 100¢No 0¢
0.1¢
N/A
$720
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 2 O/U 8.5

View
100%
1%
Yes 100¢No 0¢
0.1¢
N/A
$5
N/A
N/A
N/A
Settled
Yes
kalshi

Kaitlin Quevedo

View
0%
17%
Yes 0¢No 100¢
100¢
N/A
$866,468
N/A
N/A
$605,081
Settled
No
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 1 Winner

View
0%
99%
Yes 0¢No 100¢
—
N/A
$4,129
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 2 Winner

View
0%
99%
Yes 0¢No 100¢
—
N/A
$208
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Total Sets: O/U 2.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
$109
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Match O/U 21.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
$7
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 1 O/U 8.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 2 O/U 9.5

View
100%
1%
Yes 100¢No 0¢
0.1¢
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 1 O/U 9.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Match O/U 22.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 2 O/U 10.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Set 1 O/U 10.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
Yes
polymarket

Monterrey Open: Yulia Starodubtseva vs Elise Mertens Match O/U 23.5

View
0%
99%
Yes 0¢No 100¢
—
N/A
N/A
N/A
N/A
N/A
Settled
Yes
Total markets: 18

Intro

This market tracks who will win the professional tennis match between Quevedo and Mertens at the 2026 US Open Women Singles Round Of 128. The aggregated consensus probability for Elise Mertens winning is 85.0%, drawn from Kalshi and Polymarket, with resolution based on the match outcome at the US Open. Watch for the match result on August 30, 2026, to confirm the settlement.

PredictionHero - Resolution Divergence Alerts (RDA)

Divergence Detected

Issue: Event Scope Mismatch - Polymarket markets refer to Monterrey Open while Kalshi markets refer to US Open Women Singles Round Of 128Hero tip: Verify which tournament actually occurs and ensure you are trading the correct match. These are fundamentally different events that will resolve independently.

Critical divergence points:

  • Polymarket: Markets resolve based on the Monterrey Open match scheduled for August 27, 2026 with specific rules for match completion, cancellations, and tie scenarios
  • Kalshi: Markets resolve based on the US Open Women Singles Round Of 128 match in 2026, resolving to Yes if either player wins after a ball has been played
Our PredictionHero Resolution Divergence Alerts (RDA) are there to help users identify potential differences across platforms. They do not replace or supersede the official rules and description of any prediction market. Users are solely responsible for reviewing and understanding the applicable rules and resolution criteria before placing any trade or bet. If you notice a potential inconsistency, discrepancy, or error in an alert, please report it to our team so we can review and improve the accuracy of our data.

Polymarket

This market refers to the tennis match between Yulia Starodubtseva and Elise Mertens in the Monterrey Open, originally scheduled for August 27, 2026 at 11:00PM ET. This market will resolve to 'Yulia Starodubtseva' if Yulia Starodubtseva advances against Elise Mertens. This market will resolve to 'Elise Mertens' if Elise Mertens advances against Yulia Starodubtseva. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by September 10, 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.

Kalshi

If Kaitlin Quevedo wins the Quevedo vs Mertens professional tennis match in the 2026 US Open Women Singles Round Of 128 after a ball has been played, then the market resolves to Yes. If Elise Mertens wins the Quevedo vs Mertens professional tennis match in the 2026 US Open Women Singles Round Of 128 after a ball has been played, then the market resolves to Yes.