Wimbledon 2018: Why can't tennis' next generation step it up?

The return of Novak Djokovic as Wimbledon champion marks the seventh Grand Slam in succession won by a player 30 and older, raising serious questions about tennis' next generation of stars

It was hard to get past all the impressive numbers in the memorable Wimbledon semi-final between the South African Kevin Anderson and the American John Isner. There was their height — 6 feet 8 inches and 6 feet 10 inches, respectively. There was the fact that the two men had clocked up the highest number of aces and service winners in the tournament as their serves blitzed the court, as if a semi-automatic rifle had been attached to the top of a crane. And there was the controversy generated by the match becoming the longest semi-final at Wimbledon after it