Defending champion Alexander Zverev has booked the semi-finals slot of the ATP Finals, leaving Rafael Nadal out of the competition.
The world No 7 defeated Daniil Medvedev 6-4 7-6 (7-4) in the final match of the round-robin stage at the O2 Arena in London, to set up a meeting with Dominic Thiem.
"This arena is where I play my best tennis, we don't play in this atmosphere anywhere else in the world," he said.
"I think I've played two great matches. Only the best four players left are in the semis."
Stefanos Tsitsipas, who Nadal had beaten in 6-7 (4-7) 6-4 7-5, will face Roger Federer in the other semi-final on Saturday.
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