Yan Xiaonan will attempt to return to winning form in the next main event on the UFC schedule. Xiaonan (13-3 MMA, 6-2 UFC) is slated to meet Mackenzie Dern (12-2 MMA, 7-2 UFC) in the UFC Fight Night 211 main event on Oct. 1 at the UFC Apex in Las Vegas, and she seeks a rebound from a current two-fight losing skid. Prior to dropping back-to-back fights against Marina Rodriguez and Carla Esparza, Xiaonan put together six consecutive victories to begin her UFC tenure. One of those wins came against former title challenger Karolina Kowalkiewicz (13-7 MMA, 6-7 UFC), who…