Question: What is the ranking system used in combat sports, including boxing and mixed martial arts, of who the better fighters are relative to their weight, by which measure the Polish mixed martial artist Joanna Jędrzejczyk is rated the number 1 female MMA fighter in the world?
Sentence (from "Joanna Jędrzejczyk"): She is also currently the #8 pound-for-pound fighter in the UFC mixed gender rankings, making her the top female on the list.
Relevant evidence: No