Now that she has the No 1 ranking she's craved for so long, Dinara Safina is looking ahead to her next goal, winning a Grand Slam tournament.
Safina turned 23 today and received a pink cake from the organisers of the Porsche Grand Prix, her first tournament since she became the No. 1 one week ago.
"I try to celebrate every time I have a chance," the Russian said. "But I am working very hard to win a Grand Slam, that's my next target. I feel like I can do it. I've been in two finals. I have not finished my mission in tennis."
Safina is the 19th woman to top the rankings since they were introduced in 1975. She is also only the second Russian woman after Maria Sharapova to reach No 1.
Safina replaced Serena Williams at the top, even though the American beat her in the Australian Open final this year. Last year, Safina lost to Ana Ivanovic in the French Open final.
She and her and older sibling Marat Safin the only brother-sister duo to have been No 1 in professional tennis. Safina said the turning point in her career came last year in Berlin, when she beat then-No 1 Justine Henin and went on to win the tournament, which has disappeared from the WTA schedule. She also beat Serena Williams in that tournament.