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·Masters·ClayMarta Kostyuk defeated Anastasia Potapova 6-2, 1-6, 6-1 — Madrid Open 2026 Semifinal.
Marta Kostyuk and Anastasia Potapova: Marta Kostyuk leads 3–2 across 5 recorded meetings.
The decider hinged on the rally ball: Kostyuk won 53% of her second-serve points to Potapova's 25%, a gap that turned a 6-1 second-set wobble into a 6-1 closing set. Kostyuk converted 6 of 13 break points and cashed 75% of her second-return points, breaking the Russian's softer deliveries open down the stretch. The win moves her to 3-2 in the rivalry across five meetings.