Tennis-Ivanovic to head Pan Pacific Open field

TOKYO, May 19 (Reuters) - Serbia's world number two Ana Ivanovic will head the field at this year's new-look Pan Pacific Open tournament, organisers said on Monday.

World number six Anna Chakvetadze of Russia and former Wimbledon champion Amelie Mauresmo will also make their first appearances at the Sept. 16-21 event in Tokyo.

The Pan Pacific Open will switch from the indoor carpets of Tokyo Gymnasium to the outdoor hardcourts of Tokyo Bayside Ariake Tennis Park this year.

The tier one tournament, held in February until this year, was won by Martina Hingis last year, the Swiss winning a record fifth Tokyo title by beating Ivanovic in the final.

(Reporting by Alastair Himmer; editing by Miles Evans)