UFC 211: Miocic vs. dos Santos 2 was a mixed martial arts event produced by the Ultimate Fighting Championship held on May 13, 2017, at the American Airlines Center in Dallas, Texas.

[5] In the co-featured slot, a UFC Women's Strawweight Championship bout between current champion Joanna Jędrzejczyk and Jéssica Andrade took place.

[15] The 2008 Olympic gold medalist in freestyle wrestling and former UFC Flyweight Championship challenger Henry Cejudo was expected to face Sergio Pettis at the event.

[20] Nearly a month later, Jeff Novitzky, the UFC's VP of athlete health and performance revealed that Casey's "B" sample came back negative for banned substances and synthetic testosterone, therefore clearing her of wrongdoing both by a WADA-accredited lab and a testing laboratory hired by the TDLR.

Novitzky urged the TDLR to reverse its decision and cautioned the promotion could steer away future UFC events from Texas if the issue isn't resolved.