Novak Djokovic of Serbia looks dejected in his final game. Last year's world No 1 was knocked out in the group stage after being beaten by Roger Federer. Getty
Rising star Dominic Thiem after winning his semi-final match against Alexander Zverev at the ATP Finals in London. PA
Austrian Thiem celebrates his victory, which secured him his first appearance in the final of the ATP event. EPA
Thiem signs autographs after winning his semi final, and he takes on Greek 21-year-old Stefanos Tsitsipas in the final on Sunday. EPA
Alexander Zverev, the 22-year-old German, was the defending champion before his defeat to Thiem. Getty
Zverev was beaten by Thiem at the ATP World Tour Finals in the last four clash. EPA
Switzerland's Roger Federer returns against Greece's Stefanos Tsitsipas during their singles semi-final matchat the ATP World Tour Finals in London. AFP
Roger Federer, 38, found it tough going against 21-year-old Greek Stefanos Tsitsipas in their semi-final and lost in straight sets. Reuters
Tsitsipas celebrates making his first ATP Final after beating Roger Federer. Getty
Spaniard Rafael Nadal finishes 2019 as world No 1 despite exiting the ATP Finals in the group stage. Getty
Novak Djokovic of Serbia looks dejected in his final game. Last year's world No 1 was knocked out in the group stage after being beaten by Roger Federer. Getty
Rising star Dominic Thiem after winning his semi-final match against Alexander Zverev at the ATP Finals in London. PA
Austrian Thiem celebrates his victory, which secured him his first appearance in the final of the ATP event. EPA
Thiem signs autographs after winning his semi final, and he takes on Greek 21-year-old Stefanos Tsitsipas in the final on Sunday. EPA
Alexander Zverev, the 22-year-old German, was the defending champion before his defeat to Thiem. Getty
Zverev was beaten by Thiem at the ATP World Tour Finals in the last four clash. EPA
Switzerland's Roger Federer returns against Greece's Stefanos Tsitsipas during their singles semi-final matchat the ATP World Tour Finals in London. AFP
Roger Federer, 38, found it tough going against 21-year-old Greek Stefanos Tsitsipas in their semi-final and lost in straight sets. Reuters
Tsitsipas celebrates making his first ATP Final after beating Roger Federer. Getty
Spaniard Rafael Nadal finishes 2019 as world No 1 despite exiting the ATP Finals in the group stage. Getty
Novak Djokovic of Serbia looks dejected in his final game. Last year's world No 1 was knocked out in the group stage after being beaten by Roger Federer. Getty