Stand-in captain Michael Clarke said Wednesday Australia's inability to kill off opposing teams was becoming a serious issue.

Inability to close games killing Aussies: Clarke

Stand-in captain Michael Clarke said Wednesday Australia's inability to kill off opposing teams was becoming a serious issue.

Clarke was left nonplussed after Sri Lanka, on the back of a record ninth-wicket stand between Angelo Mathews and Lasith Malinga, staged one of the great comebacks, setting up a one-wicket win with 34 balls left in their opening one-day international in Melbourne on Wednesday.

The tourists were seemingly out for the count at 107 for eight in reply to Australia's 239 for eight from 50 overs only to come storming back to victory.

Their 132-run partnership set a world record for the ninth wicket in one-day internationals, beating the mark that had stood for 27 years.

Clarke, who was deputising for Ricky Ponting who was away at a family funeral in Tasmania, was concerned about the team's growing habit of letting the opposition off the hook.

It was also their sixth-straight loss in all forms of the game, going back to July.

Australia have two more one-dayers against Sri Lanka before the first Ashes Test against England in Brisbane on November 25.

"What I'm so disappointed in is we got so close again and we couldn't finish the game off, which is an issue we've had for a while now in all three forms of the game," Clarke told reporters.

"We've got to look at that and ask ourselves questions, find out what we can do to improve that.

"Execution cost us today with both bat and ball -- having them 8-107 we got hit around the park.

"Mathews is a very good player but Malinga is a No.10, a good No.10, but he's still a No.10 batsman.

"If we're good enough to execute our plans and get the top order out, I don't see any reason why we can't do it to the tailenders.

"But it's not the first time it's happened and it's something we need to look at."

Clarke stressed Australia could not look ahead to the Ashes, saying it was vital they improved their one-day form with the World Cup approaching early next year on the sub-continent.

"We've got a one-day World Cup coming up after the Ashes and we need to be playing our best cricket now," he said.

"The Ashes are great, everybody's looking forward to it, but we need to be focused on what's in front of us because right now, we're not playing our best cricket and we need to be."

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