(CNN) Novak Djokovic has described his Wimbledon victory over Roger Federer as the biggest mental challenge of his career after he saved two championship points to lift his fifth title at the grand slam tournament.

Sunday's match was the longest singles final in the tournament's history, with Djokovic triumphing 7-6 1-6 7-6 4-6 13-12 in just under five hours.

Federer, who was vying for a record-extending ninth Wimbledon title, had opportunities to take the first set having led 5-3 in the tiebreak and also the third when he held a set point.

But the Serb ground out the win to secure his 16th grand slam, two shy of Rafael Nadal and four behind Federer.

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