Heavyweight Denis Goltsov finished American Jordan Heiderman with an arm-triangle choke at the end of the first round, while Marina Mokhnatkina, as part of the welterweight division, delivered an elbow leverage as early as the second minute of the match and forced American Amber Librock to submit.
Goltsov will be joined in the final by Brazilian Henan Ferreira, who knocked out American Maurice Green in the first round, while Mokhnatkina will compete in her final fight of the season against Brazilian Larissa Pacheco, who knocked out Ukrainian Olena Kolesnik in 14 seconds.
Last year Pacheco won the PFL Grand Prix in the lightweight division, sensationally defeating American Kayla Harrison by unanimous decision in the final match of the event.
The final bouts of the current season will take place on November 24 at an event in New York City.
All PFL 8 tournament results.