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Australia鈥檚 Alex Carey (L) celebrates his century with Steve Smith during the second day of the second Test against Sri Lanka at Galle on Friday. | AFP photo

Commanding centuries from Steve Smith and Alex Carey gave Australia a dominating lead at stumps on day two of the second Test against Sri Lanka in Galle on Friday.

Australia, leading by 73 runs at 330-3, were poised to post a mammoth first-innings total, with Smith and Carey stitching together an unbroken 259-run stand for the fourth wicket.