But Berdych had some bad luck when a net cord bounced out and Djokovic closed out the set.

BBC: Novak Djokovic makes short work of Berdych in Melbourne

The "let" was also quickly introduced, giving the player a second chance when his delivery hits the net cord and falls into the correct service box.

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But the world number 14 appealed to the replay, which showed Federer's shot was out, and two points later Djokovic stole the set with a net cord.

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When he broke Murray in the decider an upset looked on the cards, but the Scot rallied and pulled ahead at 6-5 courtesy of a fortunate net cord.

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The 28-year-old's usually-impeccable forehand was malfunctioning badly and he survived break points in games three and five before more mistakes and a net cord saw him hand Falla a chance to serve for the set at 6-5.

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But Spanish ace Nadal kept battling and got a lucky break in the fourth game of the decider as his U.S opponent's return hit the net cord and bounced back on his side of the net to fall down a break.

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The tennis gods appeared still to be with the Croatian when a net-cord gave him three set points and he duly converted the second, to the delight of the SW19 crowd.

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