The Tecnifibre X-One Tennis Balls are fast and durable. They're the perfect choice for high level players looking for a ball that will last. The X-One Tennis Balls are used in multiple ATP Tournaments for example: Rotterdam, Gstaad, Marseille etc, with great reviews from Tour Directors.
"It's a very good ball. Lively and durable, tennis players like it very much."- Richard Krajicek - Rotterdam ATP 500 Director