Pakistan might have halted Australia's 34-game winning streak in the World Cup in Colombo on Saturday but captain Shahid Afridi was angry with his own "irresponsible" batting effort in the game.

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Chasing a modest 178 for victory, Afridi (2) once again flopped with the bat as he skied one to Brett Lee at long-on off Jason Krejza with Pakistan still needing 38 runs to win.

"Don't ask me. It was an irresponsible shot from me at that stage," Afridi said after Pakistan defeated title holders Australia by four-wickets in a low-scoring but pulsating Group league match to top Group A.

The Pakistani captain lauded his bowling attack for restricting Australia under the 200-run mark.

"We made some plans for Australia and I am happy that we stuck to that. The way (Umar) Gul and (Abdur) Rehman started was fantastic. The credit (for this victory) goes to the bowlers," Afridi said.

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He also praised young Asad Sahfiq (46) and Umar Akmal (44 not out) for their gritty performance with the bat against the mighty Australian attack.

"They are doing a great job. Both Asad and Umar played mature cricket," Afridi said.

Man-of-the-match Umar Akmal, who played a precious 44-run unbeaten innings under trying circumstances during Pakistan's chase, said at no point of time he felt pressure.

"We believed that we can win against Australia. I didn't have any pressure," he said.

"Asad played really well but was little unlucky."