The Prediction Markets

Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii

Starts in 13 hKickoff
Traded
$3K
Venues
Polymarket, Kalshi
Prices updated
just now
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What the markets expect

Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner 71.5%

Next is Boulter at 52.4%. The venues differ most on Boulter (Polymarket 50.5%, Kalshi 54%), a 3.5-point gap.

Odds by venue

Consensus blends each venue’s last price, weighted by how much has traded there. Best Yes price is the cheapest ask across venues, and the payout is what a winning $100 stake returns before fees. Open a row for each venue’s contract name, bid and ask, and how closely their rules match.

Prices come from our regular polls of each venue, the oldest 2 min ago. Ages are as of when this page was built.

  • Polymarket
  • Kalshi
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
71.5%
Polymarket 71.5%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Set Handicap: Sayaka Ishii (-1.5) vs Katie Boulter (+1.5)
Last price
71.5%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
46¢
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
BoulterArb
52.4%
Polymarket 50.5%polled, 2 min agoKalshi 54%polled, 50s agoBest Yes 51¢ on Polymarket, $100 pays $196 (1.96x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii
Last price
50.5%
As of
Polled 2 min ago
Buy Yes
51¢
Sell Yes
50¢
$100 on Yes pays
$196 (1.96x)
Volume
$1K
Trade this on Polymarket
Kalshi
Contract
Katie Boulter
Last price
54%
As of
Polled just now
Buy Yes
56¢
Sell Yes
52¢
$100 on Yes pays
$179 (1.79x)
Volume
$1K
Trade this on Kalshi
Partial parity

Payoffs match in ordinary outcomes; see the rule differences below the table.

Buying on Polymarket at 51¢ and selling on Kalshi at 52¢ nets 100 bps before fees.

Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
50.5%
Polymarket 50.5%polled, 2 min agoBest Yes 53¢ on Polymarket, $100 pays $189 (1.89x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
Last price
50.5%
As of
Polled 2 min ago
Buy Yes
53¢
Sell Yes
48¢
$100 on Yes pays
$189 (1.89x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
50%
Polymarket 50%polled, 2 min ago
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 2 Winner
Last price
50%
As of
Polled 2 min ago
Buy Yes
—
Sell Yes
—
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
50%
Polymarket 50%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Set Handicap: Katie Boulter (-1.5) vs Sayaka Ishii (+1.5)
Last price
50%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
3¢
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
50%
Polymarket 50%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Total Sets: O/U 2.5
Last price
50%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
3¢
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
49%
Polymarket 49%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Match O/U 23.5
Last price
49%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
1¢
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
49%
Polymarket 49%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Match O/U 21.5
Last price
49%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
1¢
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
49%
Polymarket 49%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Match O/U 22.5
Last price
49%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
1¢
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
48.5%
Polymarket 48.5%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 O/U 9.5
Last price
48.5%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
—
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Show 7 more outcomes
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
48.5%
Polymarket 48.5%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 O/U 8.5
Last price
48.5%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
—
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
48.5%
Polymarket 48.5%polled, 2 min agoBest Yes 97¢ on Polymarket, $100 pays $103 (1.03x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 O/U 10.5
Last price
48.5%
As of
Polled 2 min ago
Buy Yes
97¢
Sell Yes
—
$100 on Yes pays
$103 (1.03x)
Trade this on Polymarket
Completed Match
48%
Polymarket 48%polled, 2 min agoBest Yes 95¢ on Polymarket, $100 pays $105 (1.05x)
Polymarket
Contract
Completed Match
Last price
48%
As of
Polled 2 min ago
Buy Yes
95¢
Sell Yes
1¢
$100 on Yes pays
$105 (1.05x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
48%
Polymarket 48%polled, 2 min agoBest Yes 96¢ on Polymarket, $100 pays $104 (1.04x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 2 O/U 8.5
Last price
48%
As of
Polled 2 min ago
Buy Yes
96¢
Sell Yes
—
$100 on Yes pays
$104 (1.04x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
48%
Polymarket 48%polled, 2 min agoBest Yes 96¢ on Polymarket, $100 pays $104 (1.04x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 2 O/U 9.5
Last price
48%
As of
Polled 2 min ago
Buy Yes
96¢
Sell Yes
—
$100 on Yes pays
$104 (1.04x)
Trade this on Polymarket
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
48%
Polymarket 48%polled, 2 min agoBest Yes 96¢ on Polymarket, $100 pays $104 (1.04x)
Polymarket
Contract
Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 2 O/U 10.5
Last price
48%
As of
Polled 2 min ago
Buy Yes
96¢
Sell Yes
—
$100 on Yes pays
$104 (1.04x)
Trade this on Polymarket
Sayaka Ishii
42%
Kalshi 42%polled, 50s agoBest Yes 47¢ on Kalshi, $100 pays $213 (2.13x)
Kalshi
Contract
Sayaka Ishii
Last price
42%
As of
Polled just now
Buy Yes
47¢
Sell Yes
42¢
$100 on Yes pays
$213 (2.13x)
Volume
$31
Trade this on Kalshi

Possible arbitrage before fees: buy Boulter on Polymarket at 51¢, sell on Kalshi at 52¢ (100 bps). Check the rules below before trading. See all live spreads

Mostly the same bet: two differences

Where they differ

  • If the match is postponed: Kalshi resolves to a fair price if the match does not start within 48 hours of the scheduled time (tennis: not finished within two weeks); Polymarket stays open until the match is played and resolves 50-50 only if it is cancelled with no make-up (tennis: ~14 days).
  • Kalshi requires a ball to be played and pays the winner; Polymarket pays the player who advances, including on retirement. A pre-match walkover is a fair price on Kalshi, 50-50 on Polymarket.
Polymarket
Polymarket resolves via:
UMA optimistic oracle, source: wtatennis.com
Kalshi
Kalshi resolves via:
Kalshi (CFTC-regulated exchange), source: WTA
Show full rule comparison
  • If the match is postponed: Kalshi resolves to a fair price if the match does not start within 48 hours of the scheduled time (tennis: not finished within two weeks); Polymarket stays open until the match is played and resolves 50-50 only if it is cancelled with no make-up (tennis: ~14 days).
  • Kalshi requires a ball to be played and pays the winner; Polymarket pays the player who advances, including on retirement. A pre-match walkover is a fair price on Kalshi, 50-50 on Polymarket.
  • Trading closes Oct 31, 2026, 6:30 AM UTC on Polymarket and Nov 7, 2026, 1:30 AM UTC on Kalshi.

Summarized from each venue’s published rules; the venue’s own rules page is the final word.

How the odds have moved

The top 3 outcomes on both venues, with the consensus between them. Hover for exact values.

  • Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner
  • Boulter
  • Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner

Order books

Each venue’s resting orders for the selected outcome’s Yes contract, side by side. Top of book streams live; depth refreshes every 15 seconds.

Polymarket

Open on Polymarket ↗

Top of book

Connecting
Best bid
—
Spread
—
Best ask
—

Waiting for the first live quote…

Depth · top 8 levels

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Recent trades

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Kalshi

Kalshi doesn’t list Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner for this event.

What your stake buys

Enter a stake to see where it buys the most after fees, using each venue’s live order book.

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Buy

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Buys at the asks resting now (taker orders), cheapest after fees first, from order-book snapshots up to 15 seconds old. Fees: Kalshi 0.07 × price × (1 − price) per share, rounded up to the cent; Polymarket 0.05 × price × (1 − price) per share (sports rate). Fee calculator. Estimates only, not advice.

About this market

Live prediction market odds for "Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii". Pan Pacific Open, Qualification: Katie Boulter vs Sayaka Ishii Set 1 Winner leads at 71.5%. Next is Boulter at 52.4%. $3K has traded across 17 outcomes on Kalshi and Polymarket. The market is expected to resolve by Oct 31, 2026.

This market refers to the tennis match between Katie Boulter and Sayaka Ishii in the Pan Pacific Open, Qualification, originally scheduled for October 24, 2026 at 2:30AM ET. This market will resolve to 'Katie Boulter' if Katie Boulter advances against Sayaka Ishii. This market will resolve to 'Sayaka Ishii' if Sayaka Ishii advances against Katie Boulter. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 7, 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.

Questions

What does the consensus price mean?

It is the price of a Yes contract that pays $1 if the outcome happens. A 14¢ price means traders put the chance near 14%. Where two venues list the same outcome, we blend their last prices, weighting the venue with more trading volume more heavily (neither counts for less than a quarter). When only one outcome can win, each venue’s prices add up to a little over 100% (its margin); the fair chance removes that margin so the outcomes add up to exactly 100%.

How is the payout worked out?

A Yes contract pays $1 if it wins, so at the best ask a $100 stake buys 100 ÷ ask contracts. At 18¢ that is about 555 contracts, paying $556 (5.56x) if Yes happens. Venue fees and price slippage on larger orders are not included.

Why do the venues show different prices?

Each venue has its own traders, fees and order book. Contracts can also settle on slightly different terms, which is why each row lists how closely the rules match.

Is a price gap an arbitrage?

Only when you can buy Yes on one venue below what someone pays for Yes on the other, after fees, and both contracts settle the same way. We show the executable bid and ask so you can check.

How fresh are these prices?

Venue prices refresh every few minutes, and the order book and live quotes stream continuously. Each venue’s card shows when we last observed it.

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