World number one Annika Sorenstam claimed the 50th LPGA title of her 11-year career on Sunday with a successful defence of the Office Depot championship.

A final round 69 for a nine-under 207 secured a three-shot win for the 33-year-old Swede over Americans Ashli Bunch and Meg Mallon.

"It's tough to summarise how I feel. Fifty is a magical number and I never take anything for granted," she said.

"I don't want to think about it too much at the moment otherwise I'll get a little sentimental."

Sorenstam will now take a three-week break before returning for a tour event in Atlanta, Georgia, at the end of the month.