Slazenger Wimbledon Ultra vis tennis balls are the biggest-selling tennis ball in the UK and are now available to buy in quantities of 2 dozen. Slazenger has been associated with Wimbledon for over 100 years. Trusted by top players and the Lawn Tennis Association –these tennis balls are a premium quality product. High-quality tennis balls with fantastic discounts are available for multi-buy purchases. Bigger discounts are available for Trade buyers.