Rafael Nadal is trying to become the first man to win 21 Slams but Daniil Medvedev, who stopped Novak Djokovic from winning a 21st at the US Open last year.
History is against Nadal after losing the first set.
Medvedev is 18-0 at the Australian Open when he takes the first set in a match, while Nadal is 0-7 in Grand Slam finals when he loses the opening set.
Rafael Nadal managed to save two break points from Daniil Medvedev to take an early 2-1 lead.
But the Spaniard crumbled in the last few games, and did not allow himself a chance to get into this one with two double faults.
Daniil Medvedev served for the first set after breaking to love for the second consecutive Nadal service game to take a 5-2 lead.
Medvedev won first set 6-2.
Rafael Nadal leading 2-1 here in the second set, just as he did in the opening set.
Meanwhile, Medvedev is breezing through his service games.
The crowd tries to lift Nadal and he responeds with a wonder shot to break Medvedev. Leads 4-2.
Medvedev holds serve and it is 4-3 now.
Nadal serves for the second set having taken a 5-3 lead but makes a mess of it. Medvedev breaks again, holds off set point. 5-4 now in the second.
After some errors from Nadal 6-6 in the second set.
Pressure on Nadal in the tie breaker. Medvedev leads 6-5 and has set point. Medvedev wins the tie-breaker 7-5 and with that takes second set too. He leads 2-0 now.
Nadal fights on to make the third set 1-1.
Medvedev missed out on three breakpoints as Nadal made it 3-2. Medvedev has a two-set lead and is up 4-3 in this third set.
Nadal makes a comeback and leads 5-4 in the third set. Nadal serves for the set and wins it 6-4!
In a marathon 10-minute service game Nadal ties it up 1-1 in the fourth set.
This match has turned on its head and now Rafael Nadal is up a break in the fourth set.
Another double fault from Medvedev and Nadal leads 2-1 in the fourth set.
Nadal hits a two-handed backhand passing shot to re-gain the break and the crowd is on their feet cheering! Nadal leads 4-2.
Outstanding tennis from these two, Nadal wins the fourth set 6-4.