Melbourne: One of the great tennis rivalries resumes at the Australian Open today, once again posing the question whether ageing Roger Federer still has it in him to master Novak Djokovic.

Also Read: Federer vs Djokovic: Head-to-head stats, career records

Novak Djokovic and Roger Federer
Novak Djokovic and Roger Federer

The Serbian World No 1, coming off an astonishing 2015 season which fell only one win short of a calendar-year Grand Slam, is zeroing in on a sixth Australian title in Melbourne.

Federer, at 34, is in the twilight of an imperious career including his all-time men's tennis high of 17 Grand Slam titles, and still has the game to remain in the men's top three.

Today's semi-final will be their 45th meeting in a head-to-head which is on a knife-edge at 22 wins each.

Federer has lost their last three Grand Slam encounters, but still yearns for his elusive 18th major.

The Swiss legend's last major win was at Wimbledon in 2012, and since then Djokovic has accumulated five of his 10 Grand Slam titles, plus another five finals appearances.