Marta Kostyuk vs Sloane Stephens is a tennis fixture, part of US Open 2026, held on 2 September 2026, at Louis Armstrong Stadium. PredictX lists 2 prediction markets on it.

Markets on this fixture settle from the official tennis feed. Result questions resolve once the outcome is confirmed. If a result is ambiguous, or the fixture does not take place, an operator settles or voids the market by hand — and a void refunds every token committed to it, in full.

This fixture has finished. Its markets stay published as a record of what the crowd expected and what actually happened, each showing the probability it closed at. New entries are closed. PredictX runs on virtual tokens and is free to play; no money changes hands.