Swiss Indoors Basel: Alex Michelsen vs Arthur Fils

Kalshi — primary rule

If Alex Michelsen wins the Michelsen vs Fils professional tennis match in the 2026 ATP Basel Round Of 16 after a ball has been played, then the market resolves to Yes.

Polymarket — resolution criteria

This market refers to the tennis match between Alex Michelsen and Arthur Fils in the Swiss Indoors Basel, originally scheduled for October 29, 2026 at 5:00AM ET. This market will resolve to 'Alex Michelsen' if Alex Michelsen advances against Arthur Fils. This market will resolve to 'Arthur Fils' if Arthur Fils 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 12, 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.