Marnus Labuschagne smashed 104 before falling at the stroke of Tea putting Australia on course for a big first innings total on the opening day of the second Test against Sri Lanka in Galle on Friday.
The tourists, who are 1-0 ahead in the two-Test series, lost both their openers in the morning session after electing to bat at the Galle International Stadium.
Labuschagne then brought up his first hundred outside Australia and deflated Sri Lanka with his 134-run partnership with Smith, who was batting on 52.
Labuschagne got a life on 28 when Niroshan Dickwella missed a stumping opportunity.
Earlier, Australia lost David Warner (five) cheaply after the opener had his off-stump pegged back by an angling Kasun Rajitha delivery.
Usman Khawaja combined with Labuschagne in a 55-run stand to help Australia overcome the early loss.
Ramesh Mendis bowled Khawaja for 37 but suffered agony when he lured Labuschagne out of the crease, but Dickwella could not collect the ball and effect a stumping.
On another occasion, the off-spinner induced a bottom-edge from Labuschagne which sneaked through Dickwella’s legs and raced to the boundary.
By the time Dickwella stumped Labuschagne off Prabath Jayasuriya, the batsman had notched up his seventh Test hundred, which included 12 fours.
Jayasuriya, Kamindu Mendis and Maheesh Theekshana made their Test debut for Sri Lanka, who were forced into making four changes to their squad after five COVID-19 cases in their camp.