Never before has a final in London lasted so long - it went into the twelfth game of the fifth set and then into the tiebreak.
The 37-year-old eight-time champion now meets defending champion Novak Djokovic in the Grand Slam final.
Roger Federer took the honours in the much-anticipated mixed doubles clash with fellow great Serena Williams in what the latter described as the "match of her career" at the Hopman Cup in Perth, Australia.
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