TennisLIVE

Stale· updated 4m ago

Livesport Prague Open, Qualification: Sofia Costoulas vs Ayla Aksu

Other · July 19, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

$0K

Platform Prices — Sofia Costoulas

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
KalshiBest	1.69	59.0%	$0.59	---	Bet Here
Polymarket	1.65	60.5%	$0.61	+1.5pp	Bet Here

KalshiBest

$0.59

Odds

1.69

Implied

59.0%

Edge

---

Bet Here

Polymarket

$0.61

Odds

1.65

Implied

60.5%

Edge

+1.5pp

Bet Here

All Outcomes

Sofia Costoulas

Best: 60.5% on polymarket

▲+1.5%

Prediction market is 1.5% cheaper than sportsbooks. Consider buying on PM.

60.5%

59.0%

Ayla Aksu

Best: 41.5% on kalshi

▲+2.0%

Prediction market is 2.0% cheaper than sportsbooks. Consider buying on PM.

39.5%

41.5%

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.

Sofia Costoulas

cheapest single venue: kalshi at 0.590

Retail tier ($5k/venue)

$10.0K@ 0.636 avg

+0.46% vs cheapest single venue

kalshi$5.0K @ 0.633

polymarket$5.0K @ 0.639

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

Sharp tier ($25k/venue)

$50.0K@ 0.645 avg

+0.52% vs cheapest single venue

kalshi$25.0K @ 0.641

polymarket

Arbitrage Opportunity

+1.52%fillable risk-free returnEXECUTABLE

Stake split for $1,000 bankroll

Outcome	Platform	Odds	Stake	To win
Sofia Costoulasthin	kalshi	1.70	$599	$1015
Ayla Aksu	polymarket	2.53	$401	$1015

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 — Sofia Costoulas

Spread

1.5pp

polymarket at 60.5% vs kalshi at 59.0%

Expected Value

+2.54%

Per $1 staked at kalshi (1.69) if polymarket's price is fair.

Kelly Stake

3.7%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

polymarket

updated just now

Volume: $10.3K
24h Volume: $10.3K
Liquidity: $211.1K
Open Interest: $9.4K

Resolves: in 6d 22h

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

kalshi

updated just now

Volume: $30.8K
24h Volume: $22.0K
Liquidity: $0
Open Interest: $25.6K

Resolves: in 13d 22h

Settlement Timeline

polymarketin 6d 22h · Jul 26, 2026, 10:30 AM
kalshiin 13d 22h · Aug 2, 2026, 10:30 AM

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 Polymarket Trade on Kalshi

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