Feb 22, 2010, 13:28 GMT
Basel, Switzerland - Slumping Serbian former number one Ana Ivanovic Monday turned over what she hopes is a new page in her career by hiring Staffi Graf's former mentor Heinz Gunthardt as coach.
The Ivanovic management made the announcement, which brings to an end the number 23 player's coaching relationship with the adidas team, still her clothing sponsor.
Swiss television commentator Gunthardt, 51, guided Graf to a dozen Grand Slam titles.
The relationship will start next week in a New York exhibition, with 2008 Roland Garros champion Ivanovic replacing Serena Williams in a field with Venus Williams, US Open winner Kim Clijsters and double Grand Slam champion Svetlana Kuznetsova.
Ivanovic has been in a slump since her last title, earned in Linz in October, 2008.
The 22-year-old last played to a pair of defeats in Fed Cup this month while winning her only match of the season in the Australian Open first round.
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