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ITF Nogent-Sur-Marne: Marta Soriano Santiago vs Selina Atay

Other · July 21, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

$0K

Platform Prices — Marta Soriano Santiago

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
PolymarketBest	1.21	82.5%	$0.83	---	Bet Here
Kalshi	1.10	90.5%	$0.91	+8.0pp	Bet Here

PolymarketBest

$0.83

Odds

1.21

Implied

82.5%

Edge

---

Bet Here

Kalshi

$0.91

Odds

1.10

Implied

90.5%

Edge

+8.0pp

Bet Here

All Outcomes

Marta Soriano Santiago

Best: 90.5% on kalshi

▲+8.0%

Prediction market is 8.0% cheaper than sportsbooks. Consider buying on PM.

82.5%

90.5%

Selina Atay

Best: 17.5% on polymarket

▲+7.5%

Prediction market is 7.5% cheaper than sportsbooks. Consider buying on PM.

17.5%

10.0%

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.

Marta Soriano Santiago

cheapest single venue: polymarket at 0.825

Retail tier ($5k/venue)

$6.0K@ 0.931 avg

+0.12% vs cheapest single venue

kalshi$5.0K @ 0.930

polymarket$1.0K @ 0.936

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

Sharp tier ($25k/venue)

$26.0K@ 0.936 avg

+0.00% vs cheapest single venue

kalshi$25.0K @ 0.936

Arbitrage Opportunity

+8.11%theoretical onlyPAPER

Stake split for $1,000 bankroll

Selina Atay (kalshi, $108) — slippage 15.5% > 10% cap — fillable up to $179

Outcome	Platform	Odds	Stake	To win
Marta Soriano Santiago	polymarket	1.21	$892	$1081
Selina Ataythin	kalshi	10.00	$108	$1081

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 — Marta Soriano Santiago

Spread

8.0pp

kalshi at 90.5% vs polymarket at 82.5%

Expected Value

+9.70%

Per $1 staked at polymarket (1.21) if kalshi's price is fair.

Kelly Stake

25.0%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

polymarket

updated just now

Volume: $1.7K
24h Volume: $1.7K
Liquidity: $11.7K
Open Interest: $243

Resolves: in 6d 19h

Source: https://www.itftennis.com/en/tournament-calendar/

kalshi

updated just now

Volume: $13.3K
24h Volume: $7.0K
Liquidity: $0
Open Interest: $12.5K

Resolves: in 13d 19h

Settlement Timeline

polymarketin 6d 19h · Jul 28, 2026, 11:11 AM
kalshiin 13d 19h · Aug 4, 2026, 11:00 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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