Oeiras 4: Sofia Costoulas vs Anouk Koevermans

This market refers to the tennis match between Sofia Costoulas and Anouk Koevermans in the Oeiras 4, originally scheduled for April 21, 2026 at 5:00AM ET. This market will resolve to 'Sofia Costoulas' if Sofia Costoulas advances against Anouk Koevermans. This market will resolve to 'Anouk Koevermans' if Anouk Koevermans advances against Sofia Costoulas. If the match is canceled (not played at all), ends in a tie, or is delayed beyond 7 days from the scheduled date without a winner determined, 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 WTA Tour. A consensus of credible reporting may also be used.