This tennis ball is ideal for any tennis match. The US Open has been the ideal ball for demanding Grand Slam tournaments since 1978, which speaks for itself regarding excellent quality. The tennis ball is equipped with a thick felt assuring a high level of resilience and perfect playing characteristics. Get the US Open tennis ball from Wilson and bring more energy into the match. BENEFITS suitable for tournament players. Durable inner pressurized ball with excellent playing characteristics. Equipped with thick felt.