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National Bank Open: Botic van de Zandschulp vs Jakub Mensik

"National Bank Open: Botic van de Zandschulp vs Jakub Mensik" on Polymarket, Kalshi and Is Kalshi Legal in California — what traders need to know about platform choice, KYC and tax law.

National Bank Open: Botic van de Zandschulp vs Jakub Mensik Match O/U 21.5 75% National Bank Open: Botic van de Zandschulp vs Jakub Mensik Match O/U 22.5 65% National Bank Open: Botic van de Zandschulp vs Jakub Mensik Match O/U 23.5 51% Completed Match 50% Volume: $307K Liquidity: $656K Closes: 17 Aug 2026
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National Bank Open: Botic van de Zandschulp vs Jakub Mensik

Platform comparison

PlatformYES oddsNO oddsFeeKYCSettlement
Polymarket (via Is Kalshi Legal in California) Pick
polygram.ink (preferred broker)
75% 25% 0% (USDC on-chain) No-KYC up to $1,500 USDC, auto via UMA oracle Go to the live market →
Polymarket (direct)
polymarket.com
75% 25% 0% Geo-blocked in US/UK/EU USDC, on-chain Go to the live market →
Kalshi
kalshi.com
Up to 7% per trade US-only, KYC required USD Go to the live market →
Betfair Exchange
betfair.com
2-5% commission Full KYC from first trade GBP / EUR Go to the live market →
Manifold Markets
manifold.markets
Play-money (mana) None — play-money Mana (no cash-out) Go to the live market →

Outcome probabilities

Current market-implied probability for each outcome, from the live order book.

OutcomeProbability
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Match O/U 21.575%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Match O/U 22.565%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Match O/U 23.551%
Completed Match50%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 2 O/U 8.550%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 1 O/U 8.550%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 2 O/U 9.550%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 1 O/U 9.550%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 1 O/U 10.550%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 2 O/U 10.550%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set Handicap +/-1.544%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Total Sets: O/U 2.543%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 1 Winner37%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik Set 2 Winner36%
National Bank Open: Botic van de Zandschulp vs Jakub Mensik30%

Market context

Botic van de Zandschulp is due to face Jakub Mensik at the National Bank Open, and the market’s 28% yes price sits below the broader pre-match view that Mensik is the favourite. Recent tennis previews and odds boards put Mensik around 70-71% to win, with van de Zandschulp closer to 29-30%, which is broadly consistent with the current crowd-implied price rather than a sharp disagreement. [1][3][7][16]

The relevant framing for traders is that this is a single-match outcome, so the key comparator is how often a lower-rated player can beat a stronger favourite in ATP Masters-level conditions, especially on a hard court where serve quality and first-strike tennis matter. Previews for this match have already leaned towards Mensik, including straight-sets calls and moneyline pricing in the mid- to high-200s on the favourite, which is the kind of setup that often leaves limited upside unless there is a late fitness or scheduling shift. [1][2][4][13]

From a market-access perspective, German GlüStV rules are relevant because they are among the stricter European gambling regimes, so any platform-facing access assessment should treat residency, localisation, and product classification as material. US CFTC reach matters because event contracts offered to US persons can fall within derivatives oversight depending on how they are structured and distributed; in practical terms, a “no-KYC up to $1,500” policy usually means smaller accounts can buy without full identity verification, but it does not remove jurisdictional screening, sanctions checks, or platform limits on who can use the market. The main catalysts are still simple: whether the match is played on schedule, whether either player withdraws before first ball, and whether ATP or tournament organisers change the timing.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This overview of National Bank Open: Botic van de Zandschulp vs Jakub Mensik reviews the four comparable platforms from a regulatory perspective: which is accessible in your jurisdiction, where KYC kicks in, how the platform is classified by your country of residence. Live probability is the Polymarket mid; comparison columns show regulatory status, KYC thresholds and settlement options for each platform.

Resolution & payout

On Polymarket, resolution runs on-chain via UMA Optimistic Oracle. USDC payout is instant and automatic, with no KYC. Tax treatment depends on your jurisdiction — in the US, gains are usually ordinary income; in the UK, often capital gains. Consult a tax professional for your situation.

FAQ

How are winnings taxed?
Tax treatment varies by jurisdiction. In most countries, prediction market gains are treated as ordinary income or capital gains. We cannot provide tax advice — consult a tax professional for your specific situation.
Can I trade anonymously?
Pseudonymously, yes — up to the KYC threshold. Is Kalshi Legal in California stores an email address and wallet addresses rather than a legal name. Over $1,500 lifetime volume triggers KYC, after which identity is no longer anonymous.
What happens during a tax audit?
You're responsible for documenting your trades. Is Kalshi Legal in California exports a full transaction history (CSV/PDF) for tax reporting. In an audit you'll need to present these documents.
Are prediction markets gambling?
Legally unclear in most jurisdictions. Some interpretations classify them as wagering (gambling regulation applies), others as derivatives (financial regulation applies). There's no global precedent specifically for on-chain prediction markets.
Is there a withdrawal cap?
No platform-side cap. You can withdraw any amount provided KYC is complete. SEPA bank withdrawals over €15,000 trigger additional anti-money-laundering checks (statutory obligation for all platforms).
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