2019 ATP Finals – Singles
Stefanos Tsitsipas defeated Dominic Thiem in the final, 6–7(6–8), 6–2, 7–6(7–4) to win the singles tennis title at the 2019 ATP Finals. Tsitsipas was making his tournament debut. It marked the first instance since 2005, and only the fourth instance overall, that the Tour Finals champion was determined via a final-set tiebreak.
| Singles | |
|---|---|
| 2019 ATP Finals | |
| Champion | Stefanos Tsitsipas |
| Runner-up | Dominic Thiem |
| Score | 6–7(6–8), 6–2, 7–6(7–4) |
Alexander Zverev was the defending champion, but was defeated by Thiem in the semifinals.
Alongside Tsitsipas, Daniil Medvedev and Matteo Berrettini made their tournament debuts.
This marked the final Tour Finals appearance for six-time champion Roger Federer; age 38, he lost in the semifinals to Tsitsipas.
Rafael Nadal secured the year-end No. 1 ranking for the fifth time after Novak Djokovic was eliminated in the round-robin stage.