Coco Gauff showed supreme determination to come from behind against Zheng Qinwen to win the season-ending WTA Finals.
In an enthralling encounter that lasted just over three hours, the American beat the Olympic champion 3-6 6-4 7-6 (7-2) in Saudi Arabia.
At 20 years old, she is the youngest player to win the tournament since Maria Sharapova exactly two decades ago, and the youngest American since Serena Williams in 2001.
"That was a great match, I was just trying my best to hang in there and I never gave up," Gauff told Sky Sports.