Which magazine maintains the ranking of fighters in the weight class which Joanna Jędrzejczyk competes within?
Joanna Jędrzejczyk:  As of May 2017, she is the consensus #1 female strawweight, and #1 pound-for-pound female MMA fighter in the world. Pound for pound: Pound for pound is a ranking used in combat sports, such as boxing or mixed martial arts, of who the better fighters are relative to their weight (i.e., adjusted to compensate for weight class). Pound for pound:  Since 1990, "The Ring" magazine has maintained a pound for pound rank of fighters.
i don't know