Halep dropped to number two while former number one, German Angelique Kerber, who lost in the semi-finals to the Romanian, climbed seven places to ninth. The other beaten semi-finalist, Belgium's Elise Mertens, climbed 17 spots to 20th. American Venus Williams dropped three places to eighth following her first round loss.Rankings as of January 29: PtsCaroline Wozniacki 7,965Simona Halep 7,715Elina Svitolina 6,085Garbine Muguruza 5,690Karolina Pliskova 5,445Caroline #Wozniacki's six-year gap between holding the No. 1 ranking is the biggest in history! ? Check out the latest WTA rankings > https://t.co/gkL8Vz1mbz pic.twitter.com/UEMMS8PZnD
— Live Tennis (@livetennis) January 29, 2018