By John Morgan, MMA Underground Yan showed improved grappling skills in fending off submission ace Dern over the course of five rounds in Las Vegas. View the original article to see embedded media. While Chinese strawweight Yan Xiaonan is generally lauded for her striking abilities, she showed vastly improved grappling abilities, as well, en route to scoring a hard-fought decision win over Brazilian jiu-jitsu ace Mackenzie Dern. The contest served as the main event of Saturday’s UFC Fight Night 211, which streamed live on ESPN+ from the UFC Apex in Las Vegas. As expected, Yan was the aggressor…