It was late at night in rural France and Martin wanted to discuss Goats. And he didn’t mean livestock. ‘You write about sport,’ he said. ‘Who is the Greatest of All Time?’ I asked if he was talking about my stunning victory in the village boules competition the previous night, but it turned out he was thinking of a certain Serbian tennis player.

‘Novak Djokovic is the Goat,’ he said, with the certainty that comes from a third bottle of Bourgueil. I conceded that Djokovic’s record was a smidgen better than Rafael Nadal’s, though some might prefer the artistry of Roger Federer – but didn’t Bjorn Borg have an even better winning percentage in the grand slams? This pleased Martin’s Swedish wife. And the career records of Serena Williams and Martina Navratilova are right up there.

Martin was

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