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.

Australia international Josh Inglis completed his century in 90 deliveries. With that, he created history by becoming the cricketer to hit second-fastest century on Test debut. Australia meanwhile declared on 646/6 in the first innings in Galle.

Australia may be about to enter a new era of overseas Test cricket on free-to-air television as Seven prepares to broadcast the Sri Lanka series starting this week, a harbinger of future bidding for matches in India and elsewhere.

It was a debut three years in the making but Josh Inglis made it one to remember with a thrilling century against Sri Lanka to give Australia another selection headache in the lead-up to the World Test Championship.

Australia had Sri Lanka three down after opener Usman Khawaja’s first double century and a ton on debut by Josh Inglis helped the tourists to 654-6 declared in the first match on Thursday. Sri Lanka were 44-3 by stumps on day two at Galle with senior batsmen Dinesh Chandimal,

With Australia in a commanding position during their opening innings against Sri Lanka, Inglis arrived at the crease with no intention of taking things slowly.

Tea Australia 600 for 5 (Khawaja 232, Smith 141, Inglis 102, Head 57, Jayasuriya 3-193) 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 on day two in Galle.