| 2025 |
Hard |
Rei Sakamoto
m. Kaichi Uchida
4-6 7-6(4) 6-4 |
| 2024 |
Hard |
Yuta Shimizu
m. Li Tu
6-7(4) 6-4 6-2 |
| 2023 |
Hard |
Yosuke Watanuki
m. Yuta Shimizu
7-6(5) 6-4 |
| 2022 |
Hard |
Christopher Oconnell
m. Yosuke Watanuki
6-1 6-7(5) 6-3 |
| 2019 |
Hard |
Soon Woo Kwon
m. Oscar Otte
7-6(4) 6-3 |
| 2018 |
Hard |
Yasutaka Uchiyama
m. Tatsuma Ito
2-6 6-3 6-4 |
| 2017 |
Hard |
Yuichi Sugita
m. Soon Woo Kwon
6-4 2-6 7-6(2) |
| 2015 |
Hard |
Taro Daniel
m. Go Soeda
4-6 6-3 6-3 |
| 2014 |
Hard |
John Millman
m. Kyle Edmund
6-4 6-4 |
| 2013 |
Hard |
Matthew Ebden
m. Go Soeda
2-6 7-6(3) 6-3 |
| 2012 |
Hard |
Matteo Viola
m. Mirza Basic
7-6(3) 6-3 |