Strawweight contenders Mackenzie Dern and Xiaonan Yan will collide in the UFC Vegas 61 main event TONIGHT (Sat., Oct. 1, 2022) inside APEX in Las Vegas, Nevada. The promotion recently released a pre-fight video preview highlighting both combatants because the outcome could very well determine the next title contender at 115 pounds. Dern (12-2) is ranked No. 5 in the strawweight division and a “W” over Yan will mark her second straight and her sixth win in her last seven attempts. More importantly, the grappling ace will join a very short list of eligible strawweight title contenders. But only in…