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European Open: Jan-Lennard Struff vs Tallon Griekspoor

Named source: ATP official · End date Nov 1, 10:30 AM ET · View rules on Polymarket (international site) ↗

The short version

How to read this page

Traders give Jan-Lennard Struff about 44% and Tallon Griekspoor about 56% in “European Open: Jan-Lennard Struff vs Tallon Griekspoor”.

There is no price change on record for today yet, and there are more buyers than sellers near the price right now, so the order book is weighted toward a higher price.

Low surprise risk: the official final result settles it, overtime included.

Describes the price, the order book and the contract rules. Not advice and not a recommendation.

Sports event contracts are restricted or under legal challenge in several US states. Check your state’s law and the venue’s terms.

Polymarket prices shown here come from Polymarket’s international site (polymarket.com), which is not available to US residents. Polymarket US is a separate CFTC-regulated venue with its own prices. Prediction market access depends on where you live. Follow each venue’s terms and location rules, and do not use a VPN or other tools to get around them.

The details

Rule note: full game including overtimeSettled by ATP official
Fine-print risk
Low (10/100)
Match / Game Final

Pro adds the exact price, today’s change in points, buyers vs sellers in dollars, the price chart and every recorded move. See Pro

  • Official source: settlement runs on ATP official results; credible reporting as a last resort. Posts the final result after the game. No recorded moves for this market yet.
  • Fine print: Settles on the official final result as played, overtime included. Postponed games stay open until completed; cancellations follow the stated fallback. Deadline: Sun, Oct 25, 2026, 11:30 AM ET (scheduled start). Check regulation vs. overtime inclusion, the postponement rule (see rules) and cancellation handling (per the rules vs. void/refund on sportsbooks and Kalshi's own contract terms).

Source named: ATP official (not a tracked official feed, no release history)

Standardized read of public order book, official-source and contract-rule data, identical for every viewer. It describes the data and is not a recommendation. The venue’s published rules control settlement.

Live price, chart & buyers vs sellersPro

Pro shows the exact price, the change in points, buyers vs sellers in dollars, the price history and every recorded move here.

See Pro

European Open: Jan-Lennard Struff vs Tallon Griekspoor

5-point rule check

Polymarket

Named source: ATP official
Fine-print risk: Low (10/100)
  1. Source
  2. Deadline
  3. Counts as Yes
  4. Backup rules
  5. Other venues
Fine-print risk Low 10
1.
Who settles it (official source)
ATP official results; credible reporting as a last resort
2.
Deadline and time zone
Sun, Oct 25, 2026, 11:30 AM ET (scheduled start); hard deadline Sun, Nov 8, 2026, 11:59 PM ET America/New_York
3.
What counts as Yes
Match / Game FinalOfficial final result of the match; forfeits and walkovers follow the special rules stated. Rule text: "This market refers to the tennis match between Jan-Lennard Struff and Tallon Griekspoor in the European Op…"
4.
Backup rules (delays, cancellations, revisions)
If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 8, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50.
5.
Fine print and other venues
Cross-venue & fine-print settlement trap: Check regulation vs. overtime inclusion, the postponement rule (see rules) and cancellation handling (per the rules vs. void/refund on sportsbooks and Kalshi's own contract terms).
Rules text on file (Polymarket)

This market refers to the tennis match between Jan-Lennard Struff and Tallon Griekspoor in the European Open, originally scheduled for October 25, 2026 at 11:30AM ET. This market will resolve to 'Jan-Lennard Struff' if Jan-Lennard Struff advances against Tallon Griekspoor. This market will resolve to 'Tallon Griekspoor' if Tallon Griekspoor advances against Jan-Lennard Struff. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 8, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve to 50-50. If the match begins but is not completed, and one player advances due to the opponent's retirement, default, or disqualification, this market will resolve to the player who advances. If the match ends in a walkover (player withdraws before the start and the other advances automatically), this market will resolve to 50-50. The primary resolution source will be official information from the ATP Tour. A consensus of credible reporting may also be used.

European Open: Jan-Lennard Struff vs Tallon Griekspoor: resolution rules & settlement traps · PolyTruth