User blog comment:IamThorn/Yang vs Toph, Who Would Win?/@comment-4010415-20141021231221

Toph would win. She can "see" all of Yang's movements, hit Yang from a distance, and block Yang's attacks with rocks. One of Yang's major weaknesses is opponents she can't hit. She'll just get more and more beaten up, with her semblance doing nothing against Toph.