2019 Mubadala World Tennis Championship – Men's singles

Novak Djokovic was the defending champion, but lost in the semifinals to Stefanos Tsitsipas.

Rafael Nadal won his record fifth title beating debutante Tsitsipas in the final.

Seeds
• # 🇪🇸 Rafael Nadal (champion)

• # Novak Djokovic (semifinals) (third place)

• # Stefanos Tsitsipas (final) (runner-up)

• # 🇷🇺 Karen Khachanov (semifinals) (fourth place)

• # 🇷🇺 Andrey Rublev (quarterfinals) (fifth place)

• # 🇰🇷 Hyeon Chung (quarterfinals) (sixth place)