We saw two different types of royalty at Wimbledon today. The first was represented by Catherine, Princess of Wales, who earned her position by marrying the eldest grandson of Queen Elizabeth II, who’d earned her position by being the daughter of King George VI, who’d stumbled unwillingly into his position because his Nazi sympathiser brother fell madly in love with a divorced American, and so forth. The other was embodied by Roger Federer, who won his place alongside Kate in the Royal Box by claiming a record eight men’s Wimbledon titles and being one of the most celebrated tennis talents...