Novak Djokovic confident over fitness after beating Daniil Medvedev

The 31-year-old Serb earned a 6-4 6-7 (5-7) 6-2 6-3 victory over the 15th seed in Melbourne.
Djokovic was not at his fluent best, but outlasted Medvedev, 22, to win in three hours and 15 minutes.
"A couple of things have surfaced after a match like this," he said.
"I'll see how the body reacts."
Medvedev also struggled physically and grew frustrated as he paid the price for only taking two of nine break points.
However, his resistance continued until the end, saving two match points before Djokovic took the third with a wonderful cross-court winner.
Six-time champion Djokovic will play Nishikori in the last eight after the eighth seed beat Spain's Pablo Carreno Busta in controversial circumstances in a five-hour match decided by a super tie-break.
Top seed Djokovic, who tumbled over in the third set and fell again in the fourth, looked uncomfortable in the final stages of the match.
"I didn't feel so great in the final 20 minutes or so," he said.
"A bit of fatigue, a bit of hurt in the back, but nothing major. I'm confident I can be ready."
Another triumph for the top seed at Melbourne Park will see him move ahead of Australian great Roy Emerson and Roger Federer, who was knocked out by Greek youngster Stefanos Tsitsipas on Sunday, in terms of all-time victories.