Top fifteen players Juan Martin Del Potro and David Ferrer are confirmed starters for January's Heineken Tennis Open in Auckland.
Twenty year old del Potro is current ranked number eight in the world and will be the tournament's top ranked player.
He has four singles titles to his credit and reached the quarter finals of the U.S. Open where he was beaten by Andy Murray.
He's played at the tournament once before, as an 18 year old losing in the first round.
Also back is former champion and world number 12 Ferrer.
He reached the quarter finals at the Australian and French Opens and reach career high world ranking of four earlier this year.
Ferrer won the tournament in 2007 and reached the quarterfinals this year.