Djokovic pushed by Popyrin, heckler in Australian Open win - ESPN

For the second straight match at the Australian Open, Novak Djokovic dropped the second set to his unranked foe. This time, against Australian Alexei Popyrin, Djokovic was also pushed to the brink in the third.

But the 24-time Grand Slam champion regrouped, fending off four set points before ultimately winning the third set and closing out a 6-3, 4-6, 7-6 (4), 6-3 victory in a little over three hours.

After the match, Djokovic admitted that Popyrin was the «better player for a set and a half» and said he is still trying to find his form as he seeks a record-extending 11th title in Melbourne.

Popyrin, 24, hit more aces and winners than Djokovic but was undone by committing 26 more unforced errors than the world No. 1.

Djokovic also challenged a heckler to «say that to my face» during the fourth set. At 2-2, Djokovic paused, walked to the back of the court and yelled at the spectator before winning the next three games.

After clinching the victory on a Popyrin error, Djokovic — who won his 30th straight match at the Australian Open — turned around to the crowd again and yelled, pumping his fist to celebrate.

Djokovic has been dealing with a sore wrist and said after his opening match — a four-hour, four-set win over 18-year-old qualifier Dino Prizmic — that he hasn't been feeling well.

He credited Popyrin with bringing out a game plan to unsettle him.

«I haven't been playing my best, but still trying to find form,» the 36-year-old said. «Particularly in the early rounds, you play players that have nothing to lose. They come out on center court to play their best tennis.

»Hopefully I'll be able to build this as the tournament progresses."

Djokovic entered with a 13-1 record against Australian players at Grand Slams, but