Oleksandra Oliynykova vs. Mary Stoiana prediction, odds, picks for WTA Japan Open 2026

Using powerful machine learning and data analysis, we have re-simulated the result of Tuesday's Oliynykova-Stoiana women's singles match, forming part of our tennis predictions coverage.

Our famous predictive model gives Stoiana a 66% chance of defeating Oliynykova at the WTA Japan Open tournament. Additionally, Stoiana has a 63% chance of winning the first set. The simulations also show that the oddsmakers have got it right with the +3.5 games spread, with each player projected to have a 50-50 chance of covering, while the over 20.5 games has a 54% chance of hitting, according to our model.

Latest betting odds

We have sourced the most up-to-date betting odds in America for this match, which are listed here:

• Moneyline: Mary Stoiana -250, Oleksandra Oliynykova +210
• First Set: Oliynykova +162, Stoiana -200

All odds are correct at the time of publication and are subject to change.

Model picks and best bet

After matching our predictions against the best available odds, we can reveal our picks for each of the major markets in this matchup. Plus, find our best bet for the game below:

• Moneyline: Oliynykova @ +210 via DraftKings
• First Set: Stoiana @ -110 via DraftKings

According to our tennis best bets, the top play to make on this match is Oleksandra Oliynykova to win.

Although Oliynykova is less than likely to win, she provides the best value at the current available odds.

These picks are based on our probabilities matched against the implied probabilities from the current available odds.

Game info & first serve details

The WTA Japan Open match between Oleksandra Oliynykova and Mary Stoiana is scheduled to begin on Tuesday at 12:00 AM ET.

• Who: Oleksandra Oliynykova vs. Mary Stoiana
• Date: Tuesday, October 20, 2026
• Approx. Time: 12:00 AM ET/9:00 PM PT
• Tournament: WTA Osaka, Japan Women's Singles 2026
• Round: Round of 32

All dates and times in this article are United States Eastern Time unless otherwise noted.

Conclusion

We predict Mary Stoiana, with a 66% win probability, will likely beat Oleksandra Oliynykova at the WTA Japan Open tournament.

Additional tools and information for betting safely can be found in our Responsible Gambling hub.

This article's predictions and probabilities are generated by Dimers' proprietary Tennis prediction model. Our editorial team reviews the resulting content for accuracy and presentation before publication.