Australian Open: Rafael Nadal Wins In Straight Sets To Enter Third Round

"It was a tough match. I lost a lot of opportunities on break point but found a way to finally win the second set," he said.

"In the third I was more relaxed, more aggressive and found better play in that set."

Nadal had dropped only 10 games in three previous emphatic wins over 76th-ranked Delbonis, and defeat was never on the cards at Melbourne Park.

But the Argentine, whose best Grand Slam result was the third round in Melbourne in 2016, made life hard for the 19-time Grand Slam winner, fending off 16 break point chances.