A new course and a tough challenge for Lydia Ko as she tries to defend her title at the Australian Women's Open.

Fresh off winning the New Zealand Open for a third time, the world golf number one tees off in Adelaide this morning.

Ko says the Grange Golf Club will be a test with a great blend of holes where she can attack the hole and others where she'll need to hold off.

She says she has to be patient and give herself the most opportunities as possible.

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Ko tees off in the first round at 9:25am.