2018 ATP Finals – Singles

Alexander Zverev defeated Novak Djokovic in the final, 6–4, 6–3 to win the singles tennis title at the 2018 ATP Finals. It was his first ATP Finals title.

Grigor Dimitrov was the reigning champion, but failed to qualify this year.

Rafael Nadal withdrew from the event due to an abdominal injury and was replaced by John Isner. Djokovic secured the year-end world No. 1 ranking. Juan Martín del Potro qualified for the first time since 2013, but withdrew with a knee injury and was replaced by Kei Nishikori.

Kevin Anderson and Isner made their tournament debuts.

Seeds
• # 🇷🇸 Novak Djokovic (final)

• # Roger Federer (semifinals)

• # 🇩🇪 Alexander Zverev (champion)

• # Kevin Anderson (semifinals)

• # Marin Čilić (round robin)

• # 🇦🇹 Dominic Thiem (round robin)

• # 🇯🇵 Kei Nishikori (round robin)

• # 🇺🇸 John Isner (round robin)

Alternates
• # 🇷🇺 Karen Khachanov (Did not play)

• # Borna Ćorić (Did not play)

Group Lleyton Hewitt
''Standings are determined by: 1. number of wins; 2. number of matches played; 3. in two-player ties, head-to-head records; 4. in three-player ties, percentage of sets won, then percentage of games won, then ATP rankings.''