WNO 31 (Who's Number One 31) was a professional no-gi grappling event produced by FloGrappling as part of its flagship superfight series. The card featured elite submission specialists across multiple weight classes and showcased several high-profile matchups. Below are the matches for this event iteration.
| Athlete 1 | Athlete 2 | Winner | Method | Round |
|---|---|---|---|---|
| Luke Griffith | Felipe Pena | Luke Griffith | Rear naked | Championship |
| Helena Crevar | Julia Boscher | Helena Crevar | Aoki lock | Championship |
| Alexandre Ribeiro | Faris Ben-Lamkadem | Faris Ben-Lamkadem | Decision | — |
| Paige Ivette Clymer | Gabi Pessanha | Gabi Pessanha | Decision | — |
| Oliver Taza | Chris Wojcik | Chris Wojcik | Decision | — |
| Abraham La Montagne | Felipe Costa | Felipe Costa | Rear triangle | — |
| Katie Bochenek | Joslyn Molina | Joslyn Molina | Darce | — |
| Michael Bannach | Grayson Henley | Grayson Henley | Straight ankle lock | — |
| Nick Fritz | Sean Magnus | Nick Fritz | Outside heel hook | — |