Nadal seals place in Round 3 with a kiss

The Spaniard, hunting for a second Australian Open title 11 years after his first, has now lost only three sets in his last nine matches at Melbourne Park, all in his defeat to Novak Djokovic in last year's final.

Rafael Nadal passed up a good few chances for an earlier finish to his night before muscling his way into the third round of the Australian Open with a commanding 6-3, 7-6(4), 6-1 victory over Argentine Federico Delbonis on Thursday.

The match lacked nothing in quality power tennis but was almost entirely devoid of drama and the most notable incident came late in the third set when the ball flew off top seed Nadal's racket and hit a ballgirl on the head.

The 19-times Grand Slam champion raced over to check she was alright and then planted a kiss on her cheek, drawing a huge cheer from the Rod Laver Arena crowd.

"It probably was one of the scariest moments on the tennis court because the ball was straight to the head," said Nadal.

"I'm glad she's okay, she's very brave."

His mercy mission completed, Nadal went back to the baseline, re-applied his game face glare and resumed pummelling his 76th-ranked opponent.

The Spaniard, hunting for a second Australian Open title 11 years after his first, has now lost only three sets in his last nine matches at Melbourne Park, all in his defeat to Novak Djokovic in last year's final.

Delbonis never looked like adding to that tally in the two and a half hour contest, particularly as he was unable to muster up as much as a single break point.

The world number one was profligate with his own break points - converting only three of 20 - but there was never a moment of doubt that he would move through.

The 33-year-old said it was a minor concern that he was forced to go to a tiebreaker in the second set despite having nine opportunities to break Delbonis.

"When you are not able to convert one break point after I don't know how many chances, of course you are in trouble," he said.

"But that's just something that happened today. We don't need to put a lot of attention on this. It was just something that was hopefully the history of just one day."

He will next face Pablo Carreno Busta. He holds a 4-0 career record against his younger compatriot but Carreno Busta did take a set off him in their only meeting on hardcourt.

While Nadal was a bit worried about his inability to kill off his opponent on Thursday, he was unconcerned to hear that potential fourth-round opponent Nick Kyrgios had imitated his service action ticks during the Australian's match against Gilles Simon.

"I really don't care. I am here to play tennis," he said. "Honestly, I don't care at all. If was funny, good. That's it."