Australia captain Aaron Finch scored a captain's knock to help his side move top of the World Cup group table with an 87-run win over Sri Lanka at The Oval on Saturday.

Finch's 153 off 132 balls helped set a daunting total of 334-7, with Steve Smith adding 73.

Despite a flying start, Sri Lanka were ripped about by Mitchell Starc and Kan Richardson to leave them 247 all out.

After the game, Finch tried to remain humble in spite of his important contribution.

"Honestly it doesn't really bother me if I get 99 or 100," the ODI captain insisted.

"As long as you get yourself in a position to help the team win, that's what I'm more worried about."

They next face Bangladesh at Trent Bridge on Thursday, knowing another win could take them one step closer to the last four.

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