Several instances in which all the male competitors in an ultra long distance event were beaten by a woman - often by a wide margin.
Jasmin Paris: First woman to win Spine Race – interview (redbull.com)
238 Miles On Foot: Courtney Dauwalter Wins Moab Ultra | GearJunkie
There is endurance and then there is endurance!
When events are staged over those distances, and in those conditions, it starts to become a more level playing field between men and women.