Swiss Indoors Basel: Alex Michelsen vs Botic van de Zandschulp

Named source: ATP official · End date Nov 3, 4:00 AM ET · Live market: Swiss Indoors Basel: Alex Michelsen vs Botic van de Zandschulp · View rules on Polymarket (international site) ↗

Explain it simply

Built from this market’s own rules and prices. It is research, not a recommendation.

1.What this market is really asking

Alex Michelsen and Botic van de Zandschulp play a tennis match at the Swiss Indoors Basel, scheduled for October 27, 2026 at 5:00 AM ET.

This market asks: who will win?

2.Words to know

ET: Eastern Time, the time zone of New York.
Advance: To move on to the next round.
Share: One unit of a market. A share pays $1 if its result happens and $0 if it doesn’t.
Price in cents (¢): Prices run from 0¢ to 100¢ and work like a percent chance. 94¢ means the crowd gives it about a 94% chance.
Official source: The organization named in the rules whose report decides the result.
Settle (resolve): When a market is decided and shares pay out. Venues use “resolve” to mean the same thing.
50-50: Every share pays 50¢, whichever side it is. Markets use this when the rules say a result can’t be decided.
Retirement (tennis): When a player stops a match partway through, usually because of injury. The other player moves on.
Default or disqualification: When a player is removed from a match for breaking the rules. The other player moves on.
Walkover: When a player pulls out before the match starts, so the other player moves on without playing.
Regulation time: The normal length of a game, before any overtime.
Overtime: Extra playing time added when a game is tied at the end of normal time.
Kalshi: A US exchange that lists similar markets. It is regulated by the CFTC, and its rules can differ from Polymarket’s.
End date: The last day the rules allow for the result. Some markets settle earlier, and some rules allow extra time.
Credible reporting: When major news outlets agree on a result. Polymarket often uses this before official counts are final.

3.Each possible result

Alex MichelsenCrowd’s chance: about 57%
What it would mean: Alex Michelsen wins and moves on to the next round.
What has to happen: Alex Michelsen advances against Botic van de Zandschulp.
Botic van de ZandschulpCrowd’s chance: about 43%
What it would mean: Botic van de Zandschulp wins and moves on to the next round.
What has to happen: Botic van de Zandschulp advances against Alex Michelsen.

4.How the payout works

Each Alex Michelsen share pays $1 if Alex Michelsen wins and $0 if not. Botic van de Zandschulp shares work the same way.

At 57¢, the crowd gives Alex Michelsen about a 57% chance.

In the special cases listed under the fine print, every share pays 50¢ instead.

Prices change all the time. This is a snapshot of what traders think, not a forecast from us.

5.Why the price is where it is

We haven’t found an official source explaining this yet.

6.Fine print in plain English

If the match is canceled, ends in a tie, or still has no winner by November 10, 2026, the market settles 50-50 and every share pays 50¢.
If a player stops partway through (retires), or is defaulted or disqualified, the player who moves on wins the market.
If a player pulls out before the match starts (a walkover), the market settles 50-50.
The official result comes from the ATP Tour. Trusted news reports can also be used.

The short version

How to read this page

Traders give Alex Michelsen about 57% and Botic van de Zandschulp about 43% in “Swiss Indoors Basel: Alex Michelsen vs Botic van de Zandschulp”.

It fell 7 points today, and buy orders and sell orders waiting near the price are about even right now.

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

Describes the price, the order book and the contract rules. It is research, 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.

Live price & chartPro

Pro shows the exact price, the change in points, the price history and every real price move here.

See Pro

Show details for experienced traders

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: Tue, Oct 27, 2026, 5:00 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.

Swiss Indoors Basel: Alex Michelsen vs Botic van de Zandschulp

5-point rule check

Polymarket

Named source: ATP official

Fine-print risk: Low (10/100)

Source
Deadline
Counts as Yes
Backup rules
Other venues

Fine-print risk Low 10

Who settles it (official source)

ATP official results; credible reporting as a last resort

Deadline and time zone

Tue, Oct 27, 2026, 5:00 AM ET (scheduled start); hard deadline Tue, Nov 10, 2026, 11:59 PM ET America/New_York

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 Alex Michelsen and Botic van de Zandschulp in the Swiss Ind…"

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 10, 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.

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 Alex Michelsen and Botic van de Zandschulp in the Swiss Indoors Basel, originally scheduled for October 27, 2026 at 5:00AM ET. This market will resolve to 'Alex Michelsen' if Alex Michelsen advances against Botic van de Zandschulp. This market will resolve to 'Botic van de Zandschulp' if Botic van de Zandschulp advances against Alex Michelsen. If the match is canceled (not played at all), ends in a tie, or a winner has not been determined by November 10, 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.