By Frank Dalleres New balls please – and caps, quarter-zip training tops, towels and skorts – as Wimbledon enjoys a huge sales lift from ‘tenniscore’ fashion trend and Iga Swiatek’s continued success. The green and purple colour scheme; that iconic logo featuring two tennis rackets crossed at the handle – Wimbledon’s branding reflects the classy air at the sport’s most prestigious tournament and shoppers, it seems, can’t get enough of it. The All England Lawn Tennis Club is enjoying booming sales of its merchandise, with volume up 54 per cent year-on-year – and that’s before the first ball has…