While the Rugby World Cup has just started, and less than a year before the Olympics, what big data has changed in sport and what issues does this raise? Data and sport, the revolutionpublished by Editions de l’Observatoire, is an essay co-written by Yannick Nyanga (four-time French rugby champion, currently assistant coach of the Racing 92 professional team and the club’s junior team) and Aurélie Jean, doctor of science and entrepreneur, one of the figures of algorithmic science.