The 5th seed Dominic Thiem is through to his first ATP Finals title match, defeating the defending champion Alexander Zverev 7-5, 6-3 in an hour and 34 minutes. The Indian Wells champion is through to his biggest final on hard court, becoming the second player of the season with at least seven ATP finals after Daniil Medvedev and setting the title clash with Stefanos Tsitsipas on Sunday.
It was their eighth meeting and the sixth victory for the Austrian who was the favorite after beating Novak Djokovic and Roger Federer in the round-robin stage, fending off all four break chances and delivering one break in each set to cross the finish line first.
In the other semi-final, Stefanos Tsitsipas stunned favorite Roger Federer to reach the final on his debut at the ATP Finals on Saturday, beating the six-time champion 6-3 6-4 at the O2 Arena.
The stylish 21-year-old, the first Greek to qualify for tournament in half a century, soaked up everything Federer threw at him and returned it with interest to subdue the Swiss great.