TennisUPCOMING

Stale· updated 3m ago

ITF Aldershot: Rina Saigo vs Sayaka Ishii

Other · July 31, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

$0.00000000000000

Platform Prices — Rina Saigo

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
PolymarketBest	1.94	51.5%	$0.52	---	Bet Here
Kalshi	1.89	53.0%	$0.53	+1.5pp	Bet Here

PolymarketBest

$0.52

Odds

1.94

Implied

51.5%

Edge

---

Bet Here

Kalshi

$0.53

Odds

1.89

Implied

53.0%

Edge

+1.5pp

Bet Here

All Outcomes

Rina Saigo

Best: 53.0% on kalshi

▲+1.5%

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

51.5%

53.0%

Sayaka Ishii

Best: 48.5% on polymarket

▲+2.0%

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

48.5%

46.5%

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.

Rina Saigo

cheapest single venue: polymarket at 0.515

Retail tier ($5k/venue)

$10.0K@ 0.584 avg

+4.56% vs cheapest single venue

kalshi$5.0K @ 0.558

polymarket$5.0K @ 0.609

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

Sharp tier ($25k/venue)

$30.0K@ 0.718 avg

+17.78% vs cheapest single venue

polymarket$5.0K @ 0.609

kalshi

Arbitrage Opportunity

+2.04%theoretical onlyPAPER

Stake split for $1,000 bankroll

Sayaka Ishii (kalshi, $475) — slippage 4.5% — eats into edge

Outcome	Platform	Odds	Stake	To win
Rina Saigothin	polymarket	1.94	$526	$1021
Sayaka Ishiithin	kalshi	2.15	$475	$1021

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 — Rina Saigo

Spread

1.5pp

kalshi at 53.0% vs polymarket at 51.5%

Expected Value

+2.91%

Per $1 staked at polymarket (1.94) if kalshi's price is fair.

Kelly Stake

3.1%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

polymarket

updated just now

Volume: $217
24h Volume: $217
Liquidity: $7.7K
Open Interest: $11

Resolves: in 7d 10h

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

kalshi

updated just now

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

Resolves: in 14d 10h

Settlement Timeline

polymarketin 7d 10h · Aug 7, 2026, 11:00 AM
kalshiin 14d 10h · Aug 14, 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

Related Events

Tennis

▲+6.0%

ITF Hechingen: Nuria Brancaccio vs Nastasja Schunk

Vol: $1.4

Tennis

▲+2.5%

ITF Gran Canaria: Laura Pigossi vs Andrea Lazaro Garcia

Vol: $5.64

Tennis

▲+1.5%

Mubadala Citi DC Open: Rafael Jodar vs Lorenzo Musetti

Vol: $26K

Tennis

▲+1.5%

Mubadala Citi DC Open: Elisabetta Cocciaretto vs Naomi Osaka

Vol: $6K

18+ only. Gambling involves risk. Please gamble responsibly. If you or someone you know has a gambling problem, call 1-800-522-4700. OddsBridge does not accept bets -- we provide odds comparison and informational content only. Past performance does not guarantee future results. Odds and prices shown may not reflect the most current values. Always verify prices on the platform before placing a bet or trade.