Opener Glenn Maxwell's fastest century in Australia's world record 263, powered Australians to a comprehensive 85-run win over Sri Lanka ,in the first Twenty20 international in Pallekele, Sri Lanka today.Australia, broke Sri Lanka's nine-year record of 260/6 against Kenya in 2007. Sri Lanka was restricted at 178 for nine in 20 overs. Australia now leads the two-match series. Maxwell destroyed the Sri Lankan bowling attack with his unbeaten 145 off 65 balls. It was laced with 14 fours and nine sixes, after Australia were invited to bat first.Skipper David Warner gave Australia a fiery start with his 28 runs off 12 balls as he put on a 57-run opening partnership with Maxwell to lay a solid foundation.In reply, Sri Lanka were never in the chase after losing openers Tillakaratne Dilshan and Kusal Perera (4) in the first two overs of the innings. The Aussies kept picking Sri Lankan wickets at regular intervals.Skipper Dinesh Chandimal top-scored with 58 runs.