Having battled for over five hours to book his place in The Australian Open
quarter-finals, Novak Djokovic proved he is one of the fittest and mentally strong players on the circuit by seeing off Tomas Berdych.
The world number one went through a roller coaster ride against Stanislas Wawrinka in the fourth round of the event in Melbourne and eventually came out on top against the Swiss player.
A five-hour long match would take its toll on any player and Djokovic admitted he did not sleep until 5am after the battle with Wawrinka.
However, the Serb produced one of his best performances of the Grand Slam tournament against Berdych and managed to come out on top, winning 6-1 4-6 6-1 6-4.
Djokovic admitted it was tough to get through his quarter-final encounter, after his five-hour showdown with Wawrinka, who had threatened to upset the Tennis odds
He said: "I was hoping to have a shorter match, whoever won tonight, as long as it didn't go over five hours," he said.
"It was always going to be tough against Tomas. He's an established top-10 player for the last five or six years and he has a big game, big serve. If he's on he can win against anybody.
"I was aware of his qualities and I came out and played my best tennis and I'm really happy with my performance."
Only David Ferrer now stands between Djokovic and a place in yet another Australian Open final, as he goes in search of his third consecutive title at the Grand Slam Event.
If the number one seed can show the same class and resilience he produced against Wawrinka and Berdych, then it would be hard not to see Djokovic claiming the fourth Aussie Open title of his career this month.