TennisUPCOMING

Live· updated 33s ago

ITF Monastir: Marcello Serafini vs Seydina Andre

Other · May 21, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

Platform Prices — Marcello Serafini

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
PolymarketBest	2.86	35.0%	$0.35	+0.5pp	Bet Here
KalshiBest	2.90	34.5%	$0.35	---	Bet Here

PolymarketBest

$0.35

Odds

2.86

Implied

35.0%

Edge

+0.5pp

Bet Here

KalshiBest

$0.35

Odds

2.90

Implied

34.5%

Edge

---

Bet Here

All Outcomes

Marcello Serafini

Best: 35.0% on polymarket

▲+0.5%

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

35.0%

34.5%

Seydina Andre

Best: 65.5% on kalshi

▲+0.5%

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

65.0%

65.5%

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.

Marcello Serafini

cheapest single venue: kalshi at 0.345

Retail tier ($5k/venue)

$5.0K@ 0.798 avg

+0.00% vs cheapest single venue

kalshi$5.0K @ 0.798

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

Sharp tier ($25k/venue)

$25.0K@ 0.922 avg

+0.00% vs cheapest single venue

kalshi$25.0K @ 0.922

Algo-trader tier — combines order-book depth and per-book stake limits at $25k each.

Whale tier (max known capacity)

Arbitrage Opportunity

+0.50%theoretical onlyPAPER

Stake split for $1,000 bankroll

Marcello Serafini (kalshi, $347) — slippage 81.6% > 10% cap

Seydina Andre (polymarket, $653) — slippage 3.9% — eats into edge

Outcome	Platform	Odds	Stake	To win
Marcello Serafinithin	kalshi	2.90	$347	$1005
Seydina Andrethin	polymarket	1.54	$653	$1005

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 — Marcello Serafini

Spread

0.5pp

polymarket at 35.0% vs kalshi at 34.5%

Expected Value

+1.45%

Per $1 staked at kalshi (2.90) if polymarket's price is fair.

Kelly Stake

0.8%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

polymarket

updated just now

Volume: —
24h Volume: —
Liquidity: $749
Open Interest: —

Resolves: in 7d 4h

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 3h

Settlement Timeline

polymarketin 7d 4h · May 28, 2026, 10:45 AM
kalshiin 14d 3h · Jun 4, 2026, 9:30 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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