Novak Djokovic digs deep to roar into Australian Open third round

Novak Djokovic (R) shakes hands with after Australia`s Alexei Popyrin after their men`s singles match on day four of the Australian Open (Pic: AFP)

Novak Djokovic survived a huge scare to reach the third round of the Australian Open on Wednesday, beating home favourite Alexei Popyrin to stay on track for a historic 25th Grand Slam title.

The world number one showed his trademark mental strength to face down his inspired opponent, prevailing 6-3, 4-6, 7-6 (7/4), 6-3. Djokovic was kept on court for more than four hours in his first-round victory over teenager Dino Prizmic, admitting he was "a bit under the weather".

Normal service appeared to have been resumed when the Serbian 10-time champion cruised through the first set on Rod Laver Arena on Wednesday. But his unforced error count ticked up in the second set and he was broken for the first time in the fourth game.

Popyrin appeared to have blown his chance to level when he produced a sloppy service game when serving for the set. However, Djokovic, again looking out of sorts and blowing his nose during changeovers, failed to build on his break and the Australian produced an impressive backhand lob to level the match, urging the crowd to up the volume.

Popyrin asked for a medical timeout when leading 3-2 in the third set and received treatment on his left calf, accompanied by a Mexican wave among the fans. The pivotal point in the match came in the 10th game.

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Three uncharacteristic unforced errors from Djokovic's racquet gave Popyrin three set points but he was unable to capitalise, missing out on a fourth opportunity as the top seed levelled in a game lasting nearly 10 minutes. Djokovic, 36, won the tie-break to take a firm grip on the match as Popyrin received more treatment on his leg.

The Serbian appeared to get into an altercation with some fans early in the fourth set but re-focused, breaking to love in the sixth game. He broke again and sealed the victory when Popyrin went long, letting out a huge roar.

Djokovic, with 24 Slams under his belt, is already the most decorated player in the men's game -- two clear of the injured Rafael Nadal and four ahead of the retired Roger Federer. He is gunning for an 11th Australian Open title to pull clear of Margaret Court on the all-time list of majors.

(With agency inputs)