Half centuries from the in-form Kusal Mendis and skipper Angelo Mathews gave Sri Lanka the edge over Australia on the opening day of the second cricket Test in Galle today despite a five-wicket haul from Mitchell Starc. Mendis followed up his maiden century in the first Test with a top score of 86 in Galle as Sri Lanka posted a total of 281 in their first innings before then grabbing two early wickets during the tourists' response.Australia were 54 for two at stumps, still trailing the hosts by 227 runs in what is a must-win match for Steve Smith's side after they lost the first Test last weekend in Pallekele. Sri Lanka won the first Test at Pallekele by 106 runs, the first triumph in a Test match over the number one-ranked Australians in 17 years. A victory for Sri Lanka in Galle would see them secure the series with one match to spare.