AMC, the tennis brand founded by the British tennis champion Andy Murray and Castore, the growing British brand of teamwear, has signed a five-year deal to become the exclusive apparel supplier to the Lawn Tennis Association (LTA), the U.K.’s governing body for tennis. This includes LTA Performance, the LTA’s accredited coaching teams, the Billie Jean King Cup, the Davis Cup and the World Team Cup, as well as the Fever-Tree Championships at The Queen’s Club and the Nature Valley series in Nottingham, Birmingham and Eastbourne, plus the National Tennis Centre in Roehampton. There will be co-branded apparel and a replica kit, to be sold through retail channels and at events. According to the LTA, some of the proceeds will go toward supporting grassroots tennis. The deal takes effect in Jan. 1