The Prediction Markets

Chennai Open: Simona Waltert vs Lucrezia Stefanini

Starts in 12 hKickoff
Traded
$7K
Venues
Polymarket, Kalshi
Prices updated
3 min ago
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What the markets expect

Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5 65.5%

Next is Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5 at 65%. Polymarket and Kalshi agree within 1 point on each matched outcome.

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 4 min ago. Ages are as of when this page was built.

  • Polymarket
  • Kalshi
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
65.5%
Polymarket 65.5%polled, 3 min agoBest Yes 67¢ on Polymarket, $100 pays $149 (1.49x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 1 O/U 8.5
Last price
65.5%
As of
Polled 3 min ago
Buy Yes
67¢
Sell Yes
64¢
$100 on Yes pays
$149 (1.49x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
65%
Polymarket 65%polled, 3 min agoBest Yes 98¢ on Polymarket, $100 pays $102 (1.02x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 2 Winner
Last price
65%
As of
Polled 3 min ago
Buy Yes
98¢
Sell Yes
32¢
$100 on Yes pays
$102 (1.02x)
Trade this on Polymarket
Lucrezia Stefanini
65%
Kalshi 65%polled, 4 min agoBest Yes 65¢ on Kalshi, $100 pays $154 (1.54x)
Kalshi
Contract
Lucrezia Stefanini
Last price
65%
As of
Polled 4 min ago
Buy Yes
65¢
Sell Yes
64¢
$100 on Yes pays
$154 (1.54x)
Volume
$1K
Trade this on Kalshi
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
58%
Polymarket 58%polled, 3 min agoBest Yes 59¢ on Polymarket, $100 pays $169 (1.69x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
Last price
58%
As of
Polled 3 min ago
Buy Yes
59¢
Sell Yes
57¢
$100 on Yes pays
$169 (1.69x)
Volume
$4K
Trade this on Polymarket
Completed Match
50%
Polymarket 50%polled, 3 min agoBest Yes 99¢ on Polymarket, $100 pays $101 (1.01x)
Polymarket
Contract
Completed Match
Last price
50%
As of
Polled 3 min ago
Buy Yes
99¢
Sell Yes
1¢
$100 on Yes pays
$101 (1.01x)
Volume
$860
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
49%
Polymarket 49%polled, 3 min agoBest Yes 98¢ on Polymarket, $100 pays $102 (1.02x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 2 O/U 8.5
Last price
49%
As of
Polled 3 min ago
Buy Yes
98¢
Sell Yes
—
$100 on Yes pays
$102 (1.02x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
49%
Polymarket 49%polled, 3 min agoBest Yes 98¢ on Polymarket, $100 pays $102 (1.02x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 2 O/U 10.5
Last price
49%
As of
Polled 3 min ago
Buy Yes
98¢
Sell Yes
—
$100 on Yes pays
$102 (1.02x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
49%
Polymarket 49%polled, 3 min agoBest Yes 98¢ on Polymarket, $100 pays $102 (1.02x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 1 O/U 9.5
Last price
49%
As of
Polled 3 min ago
Buy Yes
98¢
Sell Yes
—
$100 on Yes pays
$102 (1.02x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
49%
Polymarket 49%polled, 3 min agoBest Yes 98¢ on Polymarket, $100 pays $102 (1.02x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 2 O/U 9.5
Last price
49%
As of
Polled 3 min ago
Buy Yes
98¢
Sell Yes
—
$100 on Yes pays
$102 (1.02x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
44.5%
Polymarket 44.5%polled, 3 min agoBest Yes 45¢ on Polymarket, $100 pays $222 (2.22x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Match O/U 21.5
Last price
44.5%
As of
Polled 3 min ago
Buy Yes
45¢
Sell Yes
44¢
$100 on Yes pays
$222 (2.22x)
Trade this on Polymarket
Show 7 more outcomes
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
44%
Polymarket 44%polled, 3 min agoBest Yes 45¢ on Polymarket, $100 pays $222 (2.22x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set Handicap +/-1.5
Last price
44%
As of
Polled 3 min ago
Buy Yes
45¢
Sell Yes
43¢
$100 on Yes pays
$222 (2.22x)
Volume
$7
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
39.5%
Polymarket 39.5%polled, 3 min agoBest Yes 43¢ on Polymarket, $100 pays $233 (2.33x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Match O/U 22.5
Last price
39.5%
As of
Polled 3 min ago
Buy Yes
43¢
Sell Yes
36¢
$100 on Yes pays
$233 (2.33x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
38%
Polymarket 38%polled, 3 min agoBest Yes 39¢ on Polymarket, $100 pays $256 (2.56x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 1 Winner
Last price
38%
As of
Polled 3 min ago
Buy Yes
39¢
Sell Yes
37¢
$100 on Yes pays
$256 (2.56x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
35.5%
Polymarket 35.5%polled, 3 min agoBest Yes 40¢ on Polymarket, $100 pays $250 (2.50x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Match O/U 23.5
Last price
35.5%
As of
Polled 3 min ago
Buy Yes
40¢
Sell Yes
31¢
$100 on Yes pays
$250 (2.50x)
Trade this on Polymarket
Waltert
35.1%
Polymarket 35.5%polled, 3 min agoKalshi 35%polled, 4 min agoBest Yes 35¢ on Kalshi, $100 pays $286 (2.86x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini
Last price
35.5%
As of
Polled 3 min ago
Buy Yes
36¢
Sell Yes
35¢
$100 on Yes pays
$278 (2.78x)
Volume
$25
Trade this on Polymarket
Kalshi
Contract
Simona Waltert
Last price
35%
As of
Polled 4 min ago
Buy Yes
35¢
Sell Yes
34¢
$100 on Yes pays
$286 (2.86x)
Volume
$73
Trade this on Kalshi
Partial parity

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

No arbitrage: the best bid elsewhere is 35¢, at or below the cheapest ask of 35¢.

Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
35%
Polymarket 35%polled, 3 min agoBest Yes 36¢ on Polymarket, $100 pays $278 (2.78x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Total Sets: O/U 2.5
Last price
35%
As of
Polled 3 min ago
Buy Yes
36¢
Sell Yes
34¢
$100 on Yes pays
$278 (2.78x)
Trade this on Polymarket
Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
21%
Polymarket 21%polled, 3 min agoBest Yes 23¢ on Polymarket, $100 pays $435 (4.35x)
Polymarket
Contract
Chennai Open: Simona Waltert vs Lucrezia Stefanini Set 1 O/U 10.5
Last price
21%
As of
Polled 3 min ago
Buy Yes
23¢
Sell Yes
19¢
$100 on Yes pays
$435 (4.35x)
Trade this on Polymarket

No cross-venue arbitrage right now: on every matched outcome, the best bid on one venue is at or below the cheapest ask on the other. Find markets with open 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 Nov 12, 2026, 4:30 AM UTC on Polymarket and Nov 19, 2026, 9:30 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.

  • Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
  • Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5
  • Lucrezia Stefanini

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 Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5 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.

$
Buy

Loading both order books…

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 "Chennai Open: Simona Waltert vs Lucrezia Stefanini". Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5 leads at 65.5%. Next is Chennai Open: Simona Waltert vs Lucrezia Stefanini Game Spread +/-2.5 at 65%. $7K has traded across 17 outcomes on Polymarket and Kalshi. The market is expected to resolve by Nov 12, 2026.

This market refers to the tennis match between Simona Waltert and Lucrezia Stefanini in the Chennai Open, originally scheduled for November 4, 2026 at 11:30PM ET. This market will resolve to 'Simona Waltert' if Simona Waltert advances against Lucrezia Stefanini. This market will resolve to 'Lucrezia Stefanini' if Lucrezia Stefanini advances against Simona Waltert. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 18, 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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