American Coco Gauff beat China's Zheng Qinwen 3-6 6-4 7-6 (7-2) to win the season-ending WTA Finals in Riyadh, Saudi Arabia.
At 20-years-old, Gauff is the youngest player to win the biggest women's tennis tournament outside of the four Grand Slam events since Maria Sharapova exactly 20 years ago.
Click here to view all the previous winners of the WTA Championship