TennisUPCOMING

Live· updated 34s ago

ITF Tsaghkadzor: Valentini Grammatikopoulou vs Sophia Ksandinov

Other · May 21, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

$0.00000

Platform Prices — Valentini Grammatikopoulou

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
PolymarketBest	1.10	90.5%	$0.91	---	Bet Here
KalshiBest	1.10	91.0%	$0.91	+0.5pp	Bet Here

PolymarketBest

$0.91

Odds

1.10

Implied

90.5%

Edge

---

Bet Here

KalshiBest

$0.91

Odds

1.10

Implied

91.0%

Edge

+0.5pp

Bet Here

All Outcomes

Valentini Grammatikopoulou

Best: 91.0% on kalshi

▲+0.5%

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

90.5%

91.0%

Sophia Ksandinov

Best: 9.5% on polymarket

▲+0.5%

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

9.5%

9.0%

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.

Valentini Grammatikopoulou

cheapest single venue: polymarket at 0.905

Retail tier ($5k/venue)

$10.0K@ 0.941 avg

+1.69% vs cheapest single venue

polymarket$5.0K @ 0.925

kalshi$5.0K @ 0.957

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

Sharp tier ($25k/venue)

$50.0K@ 0.950 avg

+2.62% vs cheapest single venue

polymarket$25.0K @ 0.925

Arbitrage Opportunity

+0.50%theoretical onlyPAPER

Stake split for $1,000 bankroll

Sophia Ksandinov (kalshi, $91) — slippage 423.6% > 10% cap

Outcome	Platform	Odds	Stake	To win
Valentini Grammatikopoulouthin	polymarket	1.10	$910	$1005
Sophia Ksandinovthin	kalshi	11.11	$91	$1006

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 — Valentini Grammatikopoulou

Spread

0.5pp

kalshi at 91.0% vs polymarket at 90.5%

Expected Value

+0.55%

Per $1 staked at polymarket (1.10) if kalshi's price is fair.

Kelly Stake

5.3%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

polymarket

updated just now

Volume: $3
24h Volume: $3
Liquidity: $279
Open Interest: $3

Resolves: in 7d 1h

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

kalshi

updated just now

Volume: $326
24h Volume: $326
Liquidity: $0
Open Interest: $306

Resolves: in 14d 1h

Settlement Timeline

polymarketin 7d 1h · May 28, 2026, 7:30 AM
kalshiin 14d 1h · Jun 4, 2026, 7:30 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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