Greek tennis star Stefanos Tsitsipas beat Austrian Dominic Thiem 6-7(6) 6-2 7-6(4) to clinch the ATP Finals on Sunday.
Tsitsipas, 21, became the youngest champion of the tournament since Lleyton Hewitt in 2001. He also became the youngest player to reach the final on debut since American Jim Courier in 1991.
"I can't sum up my emotions right now," Tsitsipas said after beating Thiem.
"It's amazing to be remembered as the 2019 champion. It is a dream come true and the best way to end this match," the new champion said.
In a keenly contested final, Tsitsipas showed exemplary serve and volley skills to go past Thiem pocketing $2.6 million winner's cheque.
"I did get nervous at some points in the match but I managed to forget about how I felt and I had momentum in the tie-break which was really tight," he added.
"My fighting spirit and me constantly trying to push myself to do better got me there in the end," an elated Tsitsipas said.
Tsitsipas who had said he would like an army of fans like Federer after beating the Swiss great was greeted by "Tsitsipas...Tsitsipas" chants as he took control of the match.
In the deciding set tie-break Tsitsipas took a 4-2 lead but Thiem came back to make it 4/4, however, the Greek superstar won the next three points to seal his third title of the year.
The ATP tournament was Tsitsipas' third title of the season. Thiem who lost the hard-fought battle has won five titles this year, including the Indian Wells Masters, and reached a second successive French Open final.
Tsitsipas, 21, became the youngest champion of the tournament since Lleyton Hewitt in 2001.