Nick Kyrgios in extraordinary mid-match altercation with fan

Nick Kyrgios has been involved in a bizarre mid-match sledging battle with a spectator at the Miami Open.

The Australian star stopped play midway through the first set against Dusan Lajovic on Sunday to talk trash with a man sitting in the front row.

‘DRAMA QUEEN’: Kyrgios takes shot at female star over controversial sledge

The exchange went on for a number of seconds, with the man standing up at one stage and taunting Kyrgios.

Nick Kyrgios and the fan had a fiery exchange. Image: Tennis TV

Kyrgios could be heard saying: “What are you doing here? It’s a Sunday night and you’ve got nothing better to do?”

The slanging match went across a number of points, with Kyrgios turning and jawing at the man after every rally.

The man was eventually ejected. (Photo by Julian Finney/Getty Images)

At one stage Kyrgios copped a code violation for delaying the game, too busy clapping and laughing at the man after he caught a ball in the crowd.

Kyrgios then applauded and waved goodbye as the man was escorted out by security.

The exchange occurred after Kyrgios hit an ace using a controversial underarm serve, with many social media users suggesting the man had sledged Kyrgios afterwards.

The commentators said the man had told Kyrgios: “get a new haircut”.

“One of the wildest sets of tennis we’ve ever seen,” one commentator said after Kyrgios took it 6-3.

Kyrgios powers into Round of 16

The Aussie eventually thumped Lajovic 6-3 6-1 in a powerhouse performance to progress to the final 16.

The Australian world No.27 was far too strong for his Serbian opponent, slamming 12 aces and winning 81 per cent of first-serve points.

Kyrgios will next meet Borna Coric for a place in the quarter-finals after the Croatian overcame Frenchman Jeremy Chardy.

Nick Kyrgios celebrates his win. (Photo by Julian Finney/Getty Images)

Djokovic goes the distance

Earlier, world No.1 Novak Djokovic was stretched to three sets but powered through the decider against Federico Delbonis.

Djokovic, aiming for a seventh title in the Masters 1000 event, overcame a second-set hiccup to prevail 7-5 4-6 6-1.

“We were very close in the beginning of the third set … It could have gone a different way,” Djokovic said.

Next up for Djokovic will be Spanish 22nd seed Roberto Bautista Agut, who prevailed 6-4 6-4 over Italian 15th seed Fabio Fognini.

Defending champion John Isner was broken in the first game but he held the rest of the way and served 16 aces to beat Albert Ramos-Vinolas 7-5 7-6 (8-6).

Isner, now 33, won the biggest title of his career in the tournament a year ago.

The American seventh seed will face Kyle Edmund who defeated 12th seed Milos Raonic 6-4 6-4.

Others to progress to the last 16 on Sunday were 17th-seeded Georgian Nikoloz Basilashvili and 18-year-old Canadian qualifier Felix Auger Aliassime.

with AAP