In 2012, Wozniacki became an endorser of Compeed Blister Patch.
At the end of 2013 she switched her racquet sponsorship from Yonex back to her long-time partner Babolat.
In 2015, Wozniacki became an endorser of Godiva Chocolatier.
She made her debut on the WTA Tour at Cincinnati's Western & Southern Financial Group Women's Open on 19 July 2005, losing to the top-seeded and eventual champion Patty Schnyder in the first round.
On 4 March she won the ,000 ITF tournament in Las Vegas, beating top-seed Akiko Morigami in the final.
She obtained a wild card for the Pacific Life Open main draw and made her Tier I debut there.
Wozniacki was seeded second in the US Open Girls' Singles in the last major tournament of 2006, US Open.Before Wimbledon Wozniacki won the Liverpool International Tennis Tournament, an exhibition tournament, beating Ashley Harkleroad in the final.Later that year she was given a wild card to the qualifying draw at Wimbledon, where she was beaten in the first round by Miho Saeki.She was seeded second with partner Anna Tatishvili in the doubles tournament, but the pair was knocked out in the semifinals by the French-Italian pair of Alizé Cornet and Corinna Dentoni, who were seeded eighth.In February at the Memphis she reached her first WTA Tour quarterfinal, beating Kristina Brandi and Ashley Harkleroad, before losing to third-seeded Sofia Arvidsson of Sweden.
Williams beat Wozniacki, ending a nine-match winning streak for Wozniacki.