Defending champion Carlos Alcaraz defeated Jiří Lehečka in the final, 7–6(7–4), 6–4 to win the singles tennis title at the 2026 Japan Open Tennis Championships. It was his first title following a four-month layoff due to a wrist injury, and his 27th ATP Tour title overall. Alcaraz was the first player to defend the Japan Open title since Pete Sampras in 1994.
This tournament marked the final professional appearance of 2014 US Open finalist, 2016 Olympic bronze medalist, and former world No. 4 Kei Nishikori. He lost in the first round to Frances Tiafoe.
Seeds
Draw
Finals
Top half
Bottom half
Qualifying Seeds
Qualifiers
Lucky loser Jaime Faria
Qualifying draw
First qualifier
Second qualifier
Third qualifier
Fourth qualifier
References
External links Main draw Qualifying draw (archived)