TennisUPCOMING

Live· updated 19s ago

Athens Open: Sapfo Sakellaridi vs Miriana Tona

Other · July 13, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

Platform Prices — Sapfo Sakellaridi

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

Sapfo Sakellaridi

Best: 53.0% on kalshi

▲+1.5%

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

53.0%

51.5%

Miriana Tona

Best: 48.5% on polymarket

▲+1.5%

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

47.0%

48.5%

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.

Sapfo Sakellaridi

cheapest single venue: polymarket at 0.515

Retail tier ($5k/venue)

$10.0K@ 0.694 avg

+9.07% vs cheapest single venue

kalshi$5.0K @ 0.636

polymarket$5.0K @ 0.751

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

Sharp tier ($25k/venue)

$30.0K@ 0.792 avg

+5.37% vs cheapest single venue

polymarket$5.0K @ 0.751

kalshi

Arbitrage Opportunity

+1.52%theoretical onlyPAPER

Stake split for $1,000 bankroll

Sapfo Sakellaridi (polymarket, $523) — slippage 11.6% > 10% cap — fillable up to $42

Miriana Tona (kalshi, $477) — slippage 4.1% — eats into edge

Outcome	Platform	Odds	Stake	To win
Sapfo Sakellaridithin	polymarket	1.94	$523	$1015
Miriana Tonathin	kalshi	2.13	$477	$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 — Sapfo Sakellaridi

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

kalshi

updated just now

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

Resolves: in 14d 12h

polymarket

updated just now

Volume: $29
24h Volume: $29
Liquidity: $13.9K
Open Interest: $29

Resolves: in 8d 6h

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

Settlement Timeline

polymarketin 8d 6h · Jul 21, 2026, 9:00 AM
kalshiin 14d 12h · Jul 27, 2026, 2:30 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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