There's plenty of movement in the rankings this week - with some huge climbers in the Top 200, ending 2017 in style.
Here are some of the most notable rankings movers:
Mihaela Buzarnescu (+4, No.59 to No.55): Two wins at the Al Habtoor Tennis Challenge in Dubai boosted the Romanian closer to breaking the Top 50.
Belinda Bencic (+24, No.98 to No.74): The 20-year-old's impressive comeback from injury continues, not dropping a single set en route to lifting the trophy in the United Arab Emirates.
Ajla Tomljanovic (+12, No.130 to No.118): Seeded seventh in Dubai, the Australian won every set on her way to the final before retiring from her match against Bencic.
Sara Errani (+11, No.144 to No.133): The Italian reached the semifinal in Dubai, having battled her way past Bulgaria's Viktoriya Tomova, 2-6, 7-5, 7-5, in the quarterfinal, and eighth seed Vera Lapko in straight sets in the round of 16.
Stefanie Voegele (+30, No.174 to No.144): The 27-year-old returned to the Top 150 after a run to the semifinal in Dubai, beating third seed Hsieh Su-Wei along the way.