TennisUPCOMING

Stale· updated 2m ago

National Bank Open: Sloane Stephens vs Belinda Bencic

Other · August 5, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

$0.0

Platform Prices — Sloane Stephens

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
KalshiBest	7.14	14.0%	$0.14	---	Bet Here
Polymarket	5.41	18.5%	$0.19	+4.5pp	Bet Here

KalshiBest

$0.14

Odds

7.14

Implied

14.0%

Edge

---

Bet Here

Polymarket

$0.19

Odds

5.41

Implied

18.5%

Edge

+4.5pp

Bet Here

All Outcomes

Sloane Stephens

Best: 18.5% on polymarket

▲+4.5%

Prediction market is 4.5% cheaper than sportsbooks. Consider buying on PM.

14.0%

18.5%

Belinda Bencic

Best: 82.0% on kalshi

▲+0.5%

Prediction market is 0.5% cheaper than sportsbooks. Consider buying on PM.

82.0%

81.5%

Aggregate liquidity

across every venue · the only place this number exists

For each outcome, the total fillable capacity if you split across every venue (Polymarket order-book depth + Kalshi order-book depth + Pinnacle / Bet365 / DraftKings stake limits). A whale can't deploy $50k on Polymarket alone without moving the price — but the same $50k splits cleanly across 4 venues at a much tighter aggregate fill price. That's what this panel shows.

Sloane Stephens

cheapest single venue: kalshi at 0.140

Retail tier ($5k/venue)

$10.0K@ 0.370 avg

+79.39% vs cheapest single venue

kalshi$5.0K @ 0.206

polymarket$5.0K @ 0.534

What you can deploy retail-sized across every venue without moving a single market.

Sharp tier ($25k/venue)

$30.0K@ 0.489 avg

+1.87% vs cheapest single venue

kalshi$25.0K @ 0.480

polymarket

Arbitrage Opportunity

+4.71%theoretical onlyPAPER

Stake split for $1,000 bankroll

Sloane Stephens (kalshi, $147) — slippage 7.6% — eats into edge

Belinda Bencic (polymarket, $853) — slippage 5.2% — eats into edge

Outcome	Platform	Odds	Stake	To win
Sloane Stephensthin	kalshi	7.14	$147	$1047
Belinda Bencicthin	polymarket	1.23	$853	$1047

Stake the listed amount on each outcome at the matching platform. Whichever outcome wins, the payout covers the full bankroll plus the margin shown. Verify prices before placing — odds drift quickly.

Cross-Platform Edge — Sloane Stephens

Spread

4.5pp

polymarket at 18.5% vs kalshi at 14.0%

Expected Value

+32.14%

Per $1 staked at kalshi (7.14) if polymarket's price is fair.

Kelly Stake

5.2%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

kalshi

updated just now

Volume: $31
24h Volume: $31
Liquidity: $0
Open Interest: $31

Resolves: in 14d 22h

polymarket

updated just now

Volume: $5
24h Volume: $5
Liquidity: $7.8K
Open Interest: —

Resolves: in 8d 21h

Source: https://www.wtatennis.com/scores

Settlement Timeline

polymarketin 8d 21h · Aug 13, 2026, 2:00 PM
kalshiin 14d 22h · Aug 19, 2026, 3:00 PM

Capital on each platform stays locked until that market settles. When platforms resolve at different times the earlier one frees up bankroll for the next opportunity.

Price History

Illustrative preview · historical tracking coming soon

Trade This Market

Trade on Kalshi Trade on Polymarket

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