The winner of eight titles, Nagyova underlined her good form by reaching a tournament final in Thailand three weeks ago.
Monica Seles and Amanda Coetzer are among the classy players Nagyova has beaten.
Her appearance at Stanley St boosts the change in the tournament's balance.
In past years, the field has had a 60-40 split in favour of players returning to Auckland.
This time, with players such as Anna Kournikova, Montolio and Nagyova already confirmed, the split has switched, with more newcomers than regulars expected.
American Amy Frazier, who reached a career-high ranking of 13 in 1995 and has banked around $US2.5 million, is another headed this way.
Frazier, 29, has been ranked inside the top 20 five times. She boasts six Women's Tennis Association singles titles and can look back at victories over many of the world's top players.
Given the entry list, Frazier is likely to be seeded seventh for the classic.
Doubles specialist and Stanley St regular Cara Black is returning.
The diminutive Zimbabwean, winner of eight doubles titles, is always popular in Auckland.
She was a singles quarter-finalist at this year's event and a beaten finalist a year earlier before going on to win the doubles with France's Alexandra Fusai.
Ticket sales for the December 31-January 5 tournament are the heaviest ever, especially for the Kournikova matches.
Though clubs have been quick to snap up a share of tickets, Auckland Tennis officials are confident there will still be some available to the public on Monday morning.
