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Prediction market on polymarket. This market refers to the tennis match between Rei Sakamoto and Matteo Arnaldi in the Japan Open Tennis Championships, originally scheduled for September 29, 2026 at 9:00PM ET. This market will resolve to "Rei Sakamoto" if Rei Sakamoto wins by 2 or more sets than Matteo Arnaldi, based on the final completed score. Otherwise, it will resolve to "Matteo Arnaldi." If the match begins but is not completed due to retirement, default, or disqualification, this market will resolve 50-50, unless the outcome of this market has already been unconditionally determined by the completed portion of play under the match format published by the tournament organizer for that round. For example, if the deciding set has begun when the match ends, Rei Sakamoto can no longer win by 2 or more sets, and this market will resolve to "Matteo Arnaldi." If the match is canceled before play begins, or a result has not been determined by October 13, 2026, 11:59 PM ET (14 days after the scheduled start), this market will resolve 50-50. Resolution will be based on official ATP results.
Resolves: 10/7/2026.