Caroline Wozniacki posed for photos during an autograph session at the Mutua Madrid Open Saturday.
Caroline Wozniacki has won a WTA-leading three titles in 2011 - Dubai, Indian Wells and Charleston.
Ana Ivanovic, this year's No.15 seed, was also at the autograph session with Caroline Wozniacki.
Ana Ivanovic had her career defining moment on clay, winning the French Open three years ago.
Maria Sharapova signed autographs for her fans after her 26 63 62 first round win over Arantxa Rus.
Rafael Nadal, Caroline Wozniacki and Ana Ivanovic at a special exhibition ahead of the tournament.
The exhibition helped raise funds for retired Spanish player Felix Mantilla's skin cancer foundation.
Ana Ivanovic, a former No.1, joined current No.1s Rafael Nadal and Caroline Wozniacki at the exo.
Ana Ivanovic and Caroline Wozniacki were interviewed by MTV after the charity exhibition match.
Caroline Wozniacki, a finalist in Madrid in 2009, beat Ayumi Morita in her first round match.
Shahar Peer celebrated her 24th birthday on Sunday with a pair of famous Looney Tunes friends.
Li Na regrouped after letting a 5-2 second set go, beating Maria Jose Martinez Sanchez, 64 76(6).
Aravane Rezai was invited to a gala dinner celebrating the 10th anniversary of the Madrid Open.
Dinara Safina got an award from Spanish paper Marca at the gala, along with all previous champions.
The Magic Box has been the site of the Mutua Madrid Open, a Premier-level WTA event, since 2009.