Australia and England will lock horns in the opening match of the ODI cricket tri-series in Sydney tomorrow. The tournament also involves World Cup Champions India. High on confidence after the 2-0 Test series win over India, the Australians will face England before renewing hostilities with the reigning World Cup title holders in Melbourne on Sunday. The tri-series is seen as a final warm-up for all the three teams ahead of the World Cup, to be co-hosted by Australia and New Zealand in less than a month's time. The series will provide players all the three teams opportunity to find their form and stake a claim in the final XI of their respective sides in the World Cup. The series will be specially vital for England as the team would look to settle down under new captain Eoin Morgan. In a big decision, England replaced Alastair Cook with Morgan as captain in less than two months before the World Cup to improve their chances. Australia are one of the favourites to lift the World Cup but will be without their inspirational skipper Michael Clarke in the tri-series as he is still recovering from a hamstring surgery. In Clarke's absence, Twenty-20 captain George Bailey willl lead the side with Steve Clarke as his deputy.