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Warner's 70-plus strike rate in first-class cricket is significantly higher than McSweeney's 41.92, but Khawaja said there were other ways a Test opener can build an innings.
The 37-year-old opening batsman had always said the World Cup in the United States and Caribbean would be his farewell to international cricket.
Australia, the ODI World Cup and world Test champions, are top of Group B after two games with England fourth.
Faced with a tough 192-run target, Super Kings tried to scale it down through Ajinkya Rahane (45), M S Dhoni (37 not out) and Daryl Mitchell (34) but Capitals carried far too many guns for them on the night.
Warner flew in straight from his brother's wedding at Hunter Valley, northy Sydney, to the SCG.
Marcus Stoinis, part of Australia's World Cup-winning squad in India, misses out.
A crowd of more than 24,000 at his home Sydney Cricket Ground rose for a final ovation as Warner left the field.
The rucksack containing the iconic headwear was discovered at the team hotel in Sydney.
CA decided it couldn't honour its commitment to have Johnson as a guest during two lunches of the Perth Test due to the harsh criticism he directed towards Warner and chairman of selectors George Bailey in his column for The West Australian.
Australia glided to 346/5 after 84 overs at stumps on day one of the series opener in Perth.
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