TennisUPCOMING

Stale· updated 3m ago

National Bank Open: James Duckworth vs Christopher O'Connell

Other · August 2, 2026

Best Price

$0.00

Worst Price

$0.00

Max Gap

0.0%

Total Volume

$0K

Platform Prices — James Duckworth

Platform	Decimal Odds	Implied %	Price▲	Edge vs Best	Action
PolymarketBest	2.63	38.0%	$0.38	---	Bet Here
Kalshi	2.44	41.0%	$0.41	+3.0pp	Bet Here

PolymarketBest

$0.38

Odds

2.63

Implied

38.0%

Edge

---

Bet Here

Kalshi

$0.41

Odds

2.44

Implied

41.0%

Edge

+3.0pp

Bet Here

All Outcomes

James Duckworth

Best: 41.0% on kalshi

▲+3.0%

Prediction market is 3.0% cheaper than sportsbooks. Consider buying on PM.

38.0%

41.0%

Christopher O'Connell

Best: 62.0% on polymarket

▲+1.0%

Prediction market is 1.0% cheaper than sportsbooks. Consider buying on PM.

62.0%

61.0%

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.

James Duckworth

cheapest single venue: polymarket at 0.380

Retail tier ($5k/venue)

$10.0K@ 0.469 avg

+14.48% vs cheapest single venue

kalshi$5.0K @ 0.410

polymarket$5.0K @ 0.529

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

Sharp tier ($25k/venue)

$30.0K@ 0.508 avg

+0.82% vs cheapest single venue

kalshi$25.0K @ 0.504

polymarket

Arbitrage Opportunity

+1.01%theoretical onlyPAPER

Fillable up to $104

James Duckworth (polymarket, $384) — slippage 7.7% — eats into edge

Outcome	Platform	Odds	Stake	To win
James Duckworththin	polymarket	2.63	$384	$1010
Christopher O'Connellthin	kalshi	1.64	$616	$1010

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 — James Duckworth

Spread

3.0pp

kalshi at 41.0% vs polymarket at 38.0%

Expected Value

+7.89%

Per $1 staked at polymarket (2.63) if kalshi's price is fair.

Kelly Stake

4.8%

Recommended bankroll fraction (capped at quarter Kelly).

Platform Activity

polymarket

updated just now

Volume: $387
24h Volume: $387
Liquidity: $11.6K
Open Interest: —

Resolves: in 7d 9h

Source: https://www.atptour.com/en/scores/current

kalshi

updated just now

Volume: $1.0K
24h Volume: $1.0K
Liquidity: $0
Open Interest: $988

Resolves: in 14d 9h

Settlement Timeline

polymarketin 7d 9h · Aug 9, 2026, 4:30 PM
kalshiin 14d 9h · Aug 16, 2026, 4:10 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 Polymarket Trade on Kalshi

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