Australia (28) 42
Tries: Slater, Tate, Cronk, Tonga 2, Morris, Smith, Lockyer Goals: Smith 5
Papua New Guinea (0) 0
Highlights - Australia 42-0 Papua New Guinea
Australia showed why they are hot favourites to defend their Four Nations title with a comprehensive win over Papua New Guinea in Sydney.
Billy Slater, Brent Tate, Cooper Cronk, Willie Tonga and Brett Morris all scored in a one-sided first half.
Cameron Smith added a sixth before captain Darren Lockyer scored a national record 34th try, and Tonga's second score rounded off the win.
The visitors showed plenty of defensive strength but never threatened to score.
It took five minutes for the home side to open the scoring, courtesy of an extremely lucky deflection.
Papua New Guinea had Lockyer's towering kick well covered until it hit the post and totally changed direction, allowing Slater to dive in and touch down.
The ease of this early score raised the spectre of an utterly one-sided rout, but Emmanuel Yere's shuddering challenge on Lockyer showed that the Kangaroos would not have things entirely their own way.
Despite the enthusiasm of their tackling, Papua New Guinea never had a chance to put together any kind of attacking move, and three tries in seven minutes only served to underline the gulf in class between the teams.
Tate finished off a cross-field passing move for a simple touch down on the right, before a terrible misjudgement by Papua New Guinea full-back Ryan Tongia gifted Cronk a try.
Smith's huge up-field clearance was about to dribble into touch, just short of the tryline, when Tongia chose to keep the ball in play, unaware of Cronk having charged upfield behind him and being in the perfect place to touch down.
Lockyer breaks Aussie try record
The visitors' naivety was highlighted again as Elijah Riyong misjudged a bouncing ball on the sixth tackle, allowing Tonga to gobble up the loose ball and touch down.
By the time another piece of clumsy defensive handling allowed Morris to stretch Australia's lead to 26-0, the Kangaroos were averaging more than a point a minute.
Safe in the knowledge their lead was secure, Australia eased off for the rest of the half.
The Papua New Guinea defensive line held solid for 16 minutes after the restart before Smith's strength saw him ride two tackles to touch down for Australia's sixth try.
This seemed to break the visitors' resistance, and three minutes later Lockyer surpassed the late Ken Irvine to become Australia's record try scorer as he notched his 34th try for his country, with a relatively straightforward score.
Slippery conditions caused by rain and the knowledge that the game was won took the edge off Australia's play in the closing stages, as their thoughts turned to next weekend's game with England in Melbourne and they sought to avoid injury against their hard-tackling opponents.
But there was just time for Tonga to cross the line for a simple touchdown to round off the victory.
Australia: Slater, Morris, Tate, Tonga, Tuqiri, Lockyer, Cronk, Myles, Smith, Civoniceva, Lewis, Thaiday, P. Gallen, P. Gallen. Replacements: Shillington, Learoyd-Lahrs, Watmough, Gidley.
Papua New Guinea: Tongia, Mark, Parker, Yere, Riyong, Nami, Aiye, Aizue, Wabo, Griffin, Loko, Aiton, Moni. Replacements: John, Kolo, Marabe, Pombo.
Referee: Shane Rehm (New Zealand)