The X-One ball is a high-pressure competition ball. The X-One is lively, fast, ultra-high-performance, and durable. It features X D-Core technology. Tecnifibre's X D-Core is a revolutionary technology that reduces ball deformation by 20% during play. This innovation allows the core to maintain its original shape for a longer period of play. At the same time, the ball retains the same dynamic signature and therefore the same feel. Play longer with the same playability. The choice of competitive players. Used in the ATP tournaments in Marseille and Rotterdam, this ball is designed for advanced players.