17-year-old Ko talks retirement

Melbourne - Only 17, top-ranked Lydia Ko says she's already planning to retire from golf by the time she's 30, and become a psychologist.

Ko makes her second start at No 1 in Thursday's first round of the Women's Australian Open at Royal Melbourne along with Karrie Webb and Australia's Su Oh, an 18-year-old who won the Australian Ladies Masters last week in her second start as a professional.

The South Korean-born Ko says she will soon start an online psychology degree to prepare for life after golf.