In pursuit of Percival X Slazenger, a limited edition summer tennis capsule; The Racquet, Country Club. Slazenger was established in 1881 by Ralph and Albert Slazenger in London and have the longest running sporting sponsorship in the world, supporting Wimbledon since 1902. Percival and Slazenger have served up technical summer shirts, shorts, relaxed athletic club sports attire and accessories. Ace.