Teen tweets her decision to turn pro

Lydia Ko, the world's top-ranked female amateur golfer, has decided to turn professional.

The 16-year-old announced her decision via social media on Wednesday.

Ko, who was born in South Korea but has lived in New Zealand for 10 years, made the announcement via her Twitter feed with a link to a YouTube video in which she appears with one of the country's top rugby players, Israel Dagg.