Ida Nilsson (Swedish, living in Norway) was a favorite in the California TNF 50 Mile scheduled for November 17, after winning two years in a row 2016 and 2017. The TNF was cancelled because of bad air resulting from forest fires. Since Ida had already traveled to the US the R2R2R was perhaps a good second best alternative.
From Instagram: "Yes, I did it! New FKT for the double crossing of Grand Canyon. 7.29.16
The Canyon was beautiful and brutal as always.
I couldn't imagine a better way to end the 2018 running season."
Also on Facebook: https://www.facebook.com/idanilssi/
Brief video here: https://twitter.com/i/status/1064051270619619328
Ida ran alone, but picked up gels on the North Rim from the person who was filming her there.
Story on Outside Online: https://www.outsideonline.com/2368901/ida-nilsson-sets-new-grand-canyon-r2r2r-fkt