It seems there might be some confusion in the information provided. As of my last knowledge update in January 2023, there is no widely recognized professional tennis player named Walker Alister or a prominent international tournament known as the Dayton Open in tennis.
However, if you are referring to a squash player or a different sport, it would be helpful to clarify. Additionally, my information might be outdated, and events or developments could have occurred since then. Please provide more context or verify the details so that I can offer a more accurate response.
