Wimbledon 2013: Novak Djokovic through after 'tricky' win

World number one Novak Djokovic is through to the second round at Wimbledon after a "tricky" straight-sets win over Florian Mayer.

The Serb was made to work by his German opponent, eventually coming through 6-3 7-5 6-4 to progress.

Djokovic admits it "took a lot of effort" to defeat Mayer, but believes his game "is there" as he aims to win his second Wimbledon title.

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