Serena Williams says she retains her desire for Grand Slam titles, although she no longer requires the success.

Serena targets more Grand Slams

Serena targets more Grand Slams

The American has pulled out of her Australian Open defence due to fears over her fitness, having only given birth to her first child in September.

It has been a whirlwind 12 months for Williams since beating sister Venus at last year's Australian Open, as not only has she become a mother, she has also got married.

Serena had planned to return to the court in Melbourne and despite being fit, said she did not feel at the level required to compete.

Inevitably, the move has also led to suggestions that the 23-time Grand Slam champion has understandably become distracted by her new responsibilities and no longer has the desire to compete.

However, the 36-year-old insists this is not the case, as although she no longer feels vindicated by success, she remains as determined as ever.

"I don't need the money or the titles or the prestige," Williams told Vogue.

"I think having a baby might help. When I'm too anxious I lose matches, and I feel like a lot of that anxiety disappeared when Olympia was born.

"Maybe this goes without saying, but it needs to be said in a powerful way: I absolutely want more grand slams."