WINNER: Nick Kyrgios celebrates a point in his fourth-round match against Andreas Seppi.
WINNER: Nick Kyrgios celebrates a point in his fourth-round match against Andreas Seppi. Patrick Scalaaap IMAGES

Just in the Nick of time for our day

NICK Kyrgios gave Australians something extra to celebrate on their national day after staging a remarkable comeback against giant-killing Italian Andreas Seppi in an epic fourth-round battle which generated unprecedented crowd scenes at Melbourne's Hisense Arena.

On the canvas after dropping the first two sets, the fearless 19 year-old scrapped like a cage fighter against the gritty Seppi who'd sprung the upset of the Australian Open in his previous match by beating world No.2 Roger Federer.

Kyrgios took the contest that will go down as one of the classics, 5-7 4-6 6-3 7-6 .8-6, after more than 210 minutes of amazing tennis.

Kyrgios slumped to the court on his back after Seppi's last shot in his gallant fight sailed out.

Kyrgios, who staved off a match point, levelled at two sets all and then raced to a 3-0 lead in the fifth set before Seppi

"It feels so good, thank you," Kyrgios told the crowd which included his mum and dad, sister and brother.

He will play either Andy Murray or Grigor Dimitrov in the quarters.

Earlier Bernard Tomic's grand slam bogey man, Czech Tomas Berdych, sent the enigmatic Queenslander packing from the Australian Open in straight sets 6-2 7-6 6-2, in a game that once again left many questions unanswered.

Tomic had promised so much in his earlier victories over Germans Tobias Kamke and Philipp Kohlschreiber, before stopping fellow Australian Sam Groth in the third round.

Berdych's serves was firing on all cylinders from the first blow, putting Tomic on the back foot after a double break to lead 4-0 in the first set.

His quarter-final rival Rafael Nadal has an 18-3 head-to-head record against Berdych and hasn't lost to him since 2006.