Novak Djokovic books place in Australia Open quarter-finals with hard-fought win over Daniil Medvedev

Novak Djokovic will face Kei Nishikori in the quarter-finals after the six-time Australian Open champion battled past 22-year-old Russian Daniil Medvedev 6-4 6-7 (5) 6-2 6-3.

After Stefanos Tsitsipas' victory over Roger Federer on Rod Laver Arena on Sunday, Medvedev was trying to strike another blow for the next generation against the old guard.

The Russian is a fiery character and had talked up his chances ahead of the match, claiming Djokovic was not the same player as at his peak and there would be chances to beat him.

He did have chances but ultimately could not take them, although it was Djokovic who was angry after allowing the first two sets to become complicated.

The world number one salvaged the situation after being broken serving for the opening set but then saw a 4-1 lead slip away in the second to his obvious frustration.

He fought back from 2-6 down in the tie-break but Medvedev took his fourth set point on a mammoth rally. Djokovic eventually wore his young opponent down but it took him three hours and 15 minutes to get across the finish line.