Dinesh Chandimal has scored an unbeaten 63 as Sri Lanka struggled to 136-5 at lunch on Day 3 in reply to Australia's imposing first innings of 654 in the first cricket test.

Australia's Usman Khawaja struck a maiden double hundred and Josh Inglis got a century on his test debut against Sri Lanka to power the tourists to a mammoth 654 for six before they declared their first innings on day two of the opening test on Thursday.

Mitchell Starc achieved a significant milestone by taking the important wicket of Dimuth Karunaratne during the second innings of the first Test. This marked the 700th wicket of his international career across all formats.

Australia’s batters have feasted on Sri Lanka’s bowling, racking up milestones and dominance on a rain-curtailed opening day of the first test in Galle.

Travis Head will replace Sam Konstas as Usman Khawaja's opening partner in the first test against Sri Lanka at Galle on Wednesday, Australia's stand-in captain Steve Smith said on the eve of the match.

Sri Lanka is staring down the barrel at 44-3 after Australia achieved its largest ever total in Asia — 654-6 declared — on day two of the first test in Galle.