National Bank Open: Marta Kostyuk vs Iga Swiatek

Platform comparison

Market context

Iga Swiatek’s meeting with Marta Kostyuk at the National Bank Open sits in the middle of a rivalry that has usually favoured the Pole, even if the latest sample has narrowed the gap. Swiatek led the head-to-head 3-0 before Kostyuk beat her at Roland Garros on 31 May 2026, and the overall record now reads 4-1 to Swiatek, with Swiatek still ahead on sets and games. That history helps explain why a market price near 46% for Kostyuk can look less like a coin flip and more like a reflection of one fresh upset against a larger body of evidence.[2][3][4][12]

For traders focused on funding flow, the practical edge is often whether the event attracts enough small deposits to deepen the book. Markets around top-10 WTA names tend to draw more casual participation when on-ramp friction is low, especially where card-like rails, Klarna-style instant pay-ins, SEPA transfers, or stablecoin deposits such as USDC reduce the time between decision and execution. In that setting, pre-match interest can lift liquidity faster than it does for lower-profile fixtures, because users can move funds, place a position, and still have the match settle within the same tournament cycle.

The main catalysts are confirmation of the draw, whether the match is actually played on the published schedule, and any last-minute injury or withdrawal news from Toronto. The market rules mean a cancellation, tie, or delay beyond seven days from the scheduled date would settle 50-50, so operational updates matter as much as form. Flashscore still listed the matchup for 8 August 2026, which suggests the key watchpoint is not the baseline booking but whether the tournament order of play changes or either player is pulled late from the field.[13][16]

Sources: 1 · 2 · 3 · 4 · 5

Methodology

This page compares National Bank Open: Marta Kostyuk vs Iga Swiatek with a focus on payment rails and deposit friction. Polymarket accepts USDC on Polygon only; Kalshi only ACH/Plaid (US only); Betfair card/SEPA in EU/UK; Manifold no deposit. Polymarket Klarna UK additionally offers Klarna and SOFORT as fiat on-ramps to USDC. Live odds reflect the Polymarket order book.

Resolution & payout

Settlement path determines payout latency. Polymarket settles on-chain (USDC, minutes). Broker frontends like Polymarket Klarna UK add Klarna/SOFORT as fiat withdrawal options with T+1 processing. Kalshi: USD via ACH (T+1 to T+3). Betfair: local currency via card/SEPA (T+1 to T+5).

UK Frequently Asked Questions

How does Klarna deposit work on Polymarket Klarna UK?

You enter the deposit amount in EUR/GBP, choose Klarna as the method, run through Klarna's standard authentication (Pay Later or Direct Bank Transfer), and Polymarket Klarna UK converts internally to USDC for the Polymarket order book. Processing: typically under 30 minutes.

What does SOFORT cost as a deposit method?

Polymarket Klarna UK charges no fees for SOFORT. The only cost is the internal FX spread (typically <1%) on EUR→USDC conversion. SOFORT itself has no end-user fees — the platform absorbs acquirer costs.

Can UK traders use Klarna to deposit on Polymarket?

Polymarket does not natively accept Klarna. To fund a Polymarket account from the UK, you must first purchase USDC via a crypto exchange (Coinbase UK, Kraken) or Revolut, then transfer to a Polygon-compatible wallet. Some third-party on-ramps (MoonPay, Transak) accept UK debit cards and may support Klarna buy-now-pay-later for crypto purchases.

What payment methods can UK users use for Polymarket?

UK traders typically use: (1) Coinbase UK or Kraken — buy USDC with GBP debit card or bank transfer; (2) Revolut — buy crypto and send to wallet; (3) MoonPay or Transak — Visa/Mastercard UK debit card directly to USDC on Polygon. Standard GBP-to-USDC conversion fees range from 0.5–2.5%.

How long do Polymarket withdrawals take for UK users?

Polymarket withdrawals to your Polygon wallet are instant (on-chain). Converting USDC back to GBP via Coinbase UK or Kraken typically takes 1–3 business days for bank transfer, or near-instant for Revolut. Polygon gas fees are minimal (<$0.01 per transaction).