answers: Wozniacki
context: 2018 Australian Open – Women's Singles Serena Williams was the defending champion, but chose not to participate this year, stating that she was not fully fit after giving birth to her daughter in September 2017. Caroline Wozniacki became the first Danish player to win a Grand Slam singles title, defeating Simona Halep in the final, 7–6, 3–6, 6–4. Wozniacki also regained the WTA no. 1 singles ranking for the first time since 2012. Both finalists saved match points earlier in the tournament: Halep saved three match points against Lauren Davis in the third round and two match points against Angelique </s> three seeds (Williams, Simona Halep and Garbiñe Muguruza) were in contention for the world No. 1 ranking at the beginning of the tournament. However, Halep and Muguruza were eliminated in the first and third rounds, respectively, with Williams retaining the top spot at the end of the tournament. The twelve seeds that lost in the opening round was the most in the opening round of any women's major tournament since the 32-seed draw was adopted at the 2001 Wimbledon Championships. Johanna Konta became the first British woman to reach the semi-final of a major since Jo Durie in 1983. Zhang </s> from Kerber. Serena's victory was her 23rd Grand Slam title in singles, surpassing Steffi Graf as the all-time leader in Grand Slam titles in the Open era. Mirjana Lučić-Baroni reached her second Grand Slam semifinal 18 years after reaching her first one at Wimbledon. Angelique Kerber "(Fourth round)" 2017 Australian Open – Women's Singles Angelique Kerber was the defending champion, but was defeated in the fourth round by Coco Vandeweghe. Serena Williams won the title her 7th Australian title overall and first Australian Open where she did not lose a set during the tournament defeating her sister Venus Williams in
question: who won the australian open women 's title