There are few certainties in life beyond the usual trite commonplaces of death and taxes – and the tendency for an unfancied outsider to upset the established order's applecart.

Sport is littered with illustrations: 10-1 shot James Braddock beating heavyweight champion Max Baer in 1934; golfer John Daly winning the PGA in 1991; Leicester City’s 5000-1 shot in taking out the English Premier League in 2015-16; the pages of history are full of such examples.