Usman Khawaja made some past selectors look silly by soaring to his highest score and Josh Inglis vindicated the current panel as Australia put Sri Lanka in a deep hole.

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.

Innings Australia 654 for 6 dec (Khawaja 232, Smith 141, Inglis 102, Head 57, Vandersay 3-182) vs Sri Lanka Opener Usman Khawaja celebrated his maiden Test double century before Josh Inglis smashed a rapid ton on debut as Australia built a formidable first-innings total of 654 for 6 before declaring late on day two in Galle.

A maiden double hundred by Usman Khawaja and terrific centuries from Steve Smith and Josh Inglis helped Australia end the second day of the first Test against Sri Lanka on a high, posting their highest-ever total in Asia at Galle on Wednesday.