The ICDMMLSS 2018: 20th International Conference on Data Mining and Machine Learning in Sports Science aims to bring together leading academic scientists, researchers and research scholars to exchange and share their experiences and research results on all aspects of Data Mining and Machine Learning in Sports Science. It also provides a premier interdisciplinary platform for researchers, practitioners and educators to present and discuss the most recent innovations, trends, and concerns as well as practical challenges encountered and solutions adopted in the fields of Data Mining and Machine Learning in Sports Science.