Finch missed out on an opportunity to become the first Australian to hit three consecutive ODI hundreds.
Australia romped to an 80-run win against Pakistan in the third one-day international on Wednesday and took an unassailable 3-0 lead in the five-match series. Captain Aaron Finch missed out on an opportunity to become the first Australian to hit three consecutive ODI hundreds but his 90 off 136 balls anchored the world champions to 266-6.
Glenn Maxwell, dropped on 28, accelerated after Finch was caught out in the deep and scored 71 off 55 balls as Pakistan conceded 90 runs in the last 10 overs.
Leg spinner Adam Zampa hurried through the Pakistan tail-enders with career-best figures of 4-43 to bowl out the home team for 186 in 44.4 overs.
Fast bowler Pat Cummins, playing his first match of the series, had earlier polished off the top order to finish with 3-24.
"If we had lost tonight, it would have been my fault for batting so slow," Finch said. "But we ended up getting a good score on a difficult wicket. The rain put a bit of moisture in the wicket, and Cummins and Behrendorff exploited that. Our spinners were incredibly good again."
Opening batsman Imam-ul-Haq top scored with 46, but Pakistan, which rested seven of its likely World Cup players for this series, always struggled against the pace of Cummins and spin of Zampa.
"We are trying to give all the players chances so that selection committee and team management both have a better picture in front of them," Pakistan captain Shoaib Malik said. "If we win two games, we have something in our pocket."
Earlier, Australia stuttered to 20-2 after unusual rain in Abu Dhabi delayed the start of the match by 15 minutes.
Usman Shinwari clean bowled Usman Khawaja in the first over and Shaun Marsh was caught off Junaid Khan.
Finch and Peter Handscomb rebuilt the innings with an 84-run stand before part-time left arm spinner Haris Sohail undone Peter Handscomb with a delivery that shaped away from the right-hander.
Handscomb hit four of his six boundaries to 18-year-old fast bowler Mohammad Hasnain in one over before being dismissed for 47 off 43 balls.
Australia was buckled down by Pakistan spinners Imad Wasim (1-34) and Yasir Shah (1-47) in the middle overs on a slow wicket before Maxwell got better of the seamers after Finch departed in the 42nd over.
Finch, who hit five fours and a six, looked set for his third successive century before he holed out at long on in Shah's last over.
Maxwell was given a let-off when Imam-ul-Haq dropped a sitter at point and the Australian batsman cut lose thereafter. Maxwell hit eight fours and a six in his chancy knock before getting run out in the 47th over.
Malik and Imam shared a 59-run stand but the Australian bowlers always controlled the game once Cummins found the outside edges of Shan Masood, Haris Sohail and Mohammad Rizwan which reduced Pakistan to 16-3.
Imad Wasim scored 43 and Umar Akmal made 36 before Zampa wrapped up the innings quickly as Pakistan was bowled out with more than five overs to spare.
Australia won the first two matches at Sharjah by identical margins of eight wickets. Dubai will host the remaining two games on Friday and Sunday.
