Leg-spinner Adam Zampa claimed three wickets to bowl Australia to victory and avoid a Twenty20 series wipeout against Sri Lanka in Adelaide on Wednesday.
Host desperate to avoid whitewash while Sri Lanka looks to sign off with a flourish.
Gunaratne unbeaten career best 84 helps Sri Lanka clinched another last-ball thriller to seal the three-match series 2-0.
Depleted hosts look to level series while visiting side has a chance to record hat-trick of T20I series win in Australia at Geelong opener.
Kapugedera smashed a four off the last ball to give Sri Lanka a thrilling five-wicket victory over Australia in their first T20I at the MCG on Friday.
Veteran Western Australian batsman Michael Klinger will be making his debut against Sri Lanka at the MCG on Friday.
Sri Lanka pace spearhead Lasith Malinga, who has recovered fully from knee injury he suffered last month, has been recalled in the 15-man T20 squad.
Chris Lynn was named Wednesday in Australian squad for their Twenty20 series against Sri Lanka. with four uncapped players also included.
Steve Smith and vice-captain David Warner resting ahead of the tour of India.
Australia to take on Sri Lanka as CA announces T20 fixtures for 2016-17 summer.