Matthew Breetzke slammed a superb 88 and speedster Lungi Ngidi claimed five wickets as South Africa crushed Australia by 84 runs to win the second one-day international and the series in Mackay on Friday.

Australia captain Pat Cummins said the World Test Championship final against South Africa was a good advertisement for Test cricket despite hurtling towards a likely finish within three days.

Australia batting great Steve Smith is expecting a tough examination from South Africa's impressive pace attack in this week's World Test Championship final at Lord's.

Lungi Ngidi says South Africa will be looking to blast Bangladesh off the park with pace at the Twenty20 World Cup on Thursday, targeting the top order in particular to "cut the head off the snake".