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But wait.. there was one match left to go - and it's been a massive upset! Angelique Kerber, who was defending her title in Australia, crashes out 2-6,3-6 to CoCo Vandeweghe of the USA.
Nishikori stays in it! Apart from one stray shot, he hasn't done too much wrong here. He's broken Federer's serve already and needs to break it here, trailing 3-5 in the final set.
Nishikori survives! He's fighting and how. Guess it's not over till it's over, but Federer has pulled out some great points here. Nishikori's positivity is the most impressive here, and the Japanese ace has reached deep for some wonderful shots.
There's a great angled one-handed backhand from Nishikori to deny Federer a point, but the Swiss follows that up with an ace in his service game. And there's a quick forehand winner to finish as Federer leads 4-1 in the final set. Is this it for Nishikori?
Nishikori's depth is humongous, and he holds at a pressure time. He's managed now to hold that service game, a big one. He's finally opened his account in the final set to trail 1-3.
This might as well be match point for Federer. He's about to break Nishikori again, and there are some incredibly fast shots being played on court! Just as Federer looks set to break, Nishikori comes up with a great shot.
It's not just Federer - it has seemed like all of the old guard have outlasted their younger counterparts and how! We saw that in the Rafael Nadal - Sascha Zverev match, we're seeing it now with Kei Nishikori, and we could well see it again.
Nishikori looks motivated. After breaking - and being spurred on, he leads 5-3 in the fourth. And he's one break away from taking the match to a fifth set. Whaaat??
Top tennis from Nishikori! Having lost the last 5 games on a roll, he pulls back for some well-placed shots and out of nowhere, a service hold. He's pulling himself back together quickly.
There's a rare outburst from the usually calm Nishikori, who throws his racquet to the ground. Not nice. But he quickly pulls together and engages Federer in a powerful rally.
