HAMBANTOTA: Australian captain Michael Clarke won the toss and asked Sri Lanka to bat in the third one-day international on Tuesday.Sri Lanka, who trail 2-0 in the five-match series, will be without injured all-rounder Angelo Mathews for a game they must win to stay afloat in the series.Middle-order batsman Chamara Silva replaced Mathews, while debutant seamer Shaminda Eranga came in for spinner Rangana Herath.Australia retained the same side that won the second match on Sunday.Sri Lanka: Tillakaratne Dilshan (capt), Upul Tharanga, Kumar Sangakkara, Mahela Jayawardene, Chamara Silva, Dinesh Chandimal, Jeevan Mendis, Lasith Malinga, Ajantha Mendis, Nuwan Kulasekara, Shaminda Eranga.Australia: Michael Clarke (capt), Shane Watson, Brad Haddin, Ricky Ponting, Michael Hussey, David Hussey, Steven Smith, Mitchell Johnson, Brett Lee, Xavier Doherty, Doug Bollinger.