Nikita Mashtakov will defeat Leyton Rivera to advance in the ITF M15 Mistelbach 1/16-finals on clay on August 18, 2026. Mashtakov, listed in the event notes as Mykyta Mashtakov, is 27 years old with a career-high ATP ranking of 575 and a current ranking of 663, and he arrives after a 2:1 win agains…