Wimbledon 2015: John McEnroe on Novak Djokovic's sliding forehand

Defending Wimbledon champion Novak Djokovic hits a stunning sliding forehand mid-rally during his second round match against Jarkko Nieminen.

BBC Sport commentator and John McEnroe says that "in the old days" players would slide only if they had to, and the Serb's technique for generating power off the back foot leaves the three-time Wimbledon champion impressed.

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