Seita Watanabe
2018
| J2 NAGOYA | Semi | |
| J500OSAKA | 2R | |
| J2 TAINAN | [2] | 2R |
| J1 SARAWAK | [15] | 2R |
| J1 NONTHABURI | [15] | Quarter |
| J1 TRARALGON | 1R |
2017
| J2 NAGOYA | [6] | Quarter |
| J2 NONTHABURI | [5] | Quarter |
| J3 SARAWAK | [2] | Semi |
| J4 HYOGO-2 | [1] | Semi |
| J4 HYOGO | [1] | Win |
| J1 NANJING | [9] | 3R |
| J2 BEIJING | [3] | 1R |
| J3 BEIJING | [1] | 1R |
| J4 BEIJING | [1] | Quarter |
| J1 SARAWAK | Quarter | |
| J1 NONTHABURI | 1R | |
| J3 SHENZHEN | [5] | Quarter |
| J3 AUCKLAND | [5] | Quarter |
Nation
JPN
Age
25 years old (born in 2000)
World Ranking
ATP Ranking　1670th
Year-end Junior World Ranking
- Year-end 2018 206th
Match Details
2018 J2 NAGOYA
| W | 1R | Masumi Komada | 6-1 6-1 |
| W | 2R | Bora Sengul | 6-3 6-0 |
| W | 3R | Christian Lerby | 6-3 6-2 |
| W | QF | Tomoya Fujiwara | 6-3 3-6 7-6 |
| L | SF | Gauthier Onclin | 4-6 3-6 |
J500OSAKA
| W | 1R | Bora Sengul | 6-2 6-1 |
| L | 2R | Roko Horvat | 4-6 6-2 5-7 |
2018 J2 TAINAN
| W | 1R | Cheng Wei Wu | 6-4 6-3 |
| L | 2R | Chang-Lin Tsai | 3-6 3-6 |
2018 J1 SARAWAK
| L | 2R | Ki Lung Ng | 5-7 1-6 |
2018 J1 NONTHABURI
| W | 2R | Brian Bencic | 6-4 6-2 |
| W | 3R | Yanki Erel | 6-4 6-2 |
| L | QF | Jonas Forejtek | 4-6 1-6 |
2018 J1 TRARALGON
| L | 1R | Ray Ho | 6-7 3-6 |
2017 J2 NAGOYA
| W | 2R | Ryotaro Koshiba | 6-2 6-1 |
| W | 3R | Riku Takahata | 7-6 6-2 |
| L | QF | Tristan Boyer | 5-7 1-6 |
2017 J2 NONTHABURI
| W | 2R | Herman Hoeyeraal | 6-0 6-2 |
| W | 3R | Sumit Sarkar | 6-4 6-3 |
| L | QF | Siddhant Banthia | 6-7 6-7 |
2017 J3 SARAWAK
| W | 2R | Theertha Shashank Macherla | 6-2 6-2 |
| W | 3R | Kasidit Samrej | 6-4 6-1 |
| W | QF | Bingyu Yu | 6-1 6-1 |
| L | SF | Digvijay Pratap Singh | 7-5 5-7 3-6 |
2017 J4 HYOGO-2
| W | 1R | Ryotaro Koshiba | 6-2 6-4 |
| W | 2R | Hirotaka Shoji | 6-0 6-2 |
| W | QF | Hiroki Sakagawa | 6-1 6-4 |
| L | SF | Hikaru Shiraishi | 7-5 4-6 4-6 |
2017 J4 HYOGO
| W | 1R | Chang-Lin Tsai | 6-0 6-3 |
| W | 2R | Hiroki Sakagawa | 6-2 6-0 |
| W | QF | Motoharu Ishigure | 6-4 6-3 |
| W | SF | Shunsuke Mitsui | 6-3 5-7 6-4 |
| W | F | Keisuke Saitoh | 6-4 6-1 |
2017 J1 NANJING
| W | 2R | Zhiyu Chen | - - - |
| L | 3R | Bang Shuo Yin | 3-6 2-6 |
2017 J2 BEIJING
| L | 1R | Tao Mu | 2-6 1-6 |
2017 J3 BEIJING
| L | 1R | Ray Ho | 6-7 0-6 |
2017 J4 BEIJING
| W | 1R | Yu Lun Xie | 6-0 6-0 |
| W | 2R | Mingyuan Yang | 3-6 6-3 6-1 |
| W | 3R | Bohua Dong | 6-1 6-1 |
| L | QF | Yanjie Zheng | 2-6 3-6 |
2017 J1 SARAWAK
| W | 1R | Arun Venkat Guruswamy | 6-0 6-1 |
| W | 2R | Finn Reynolds | 6-2 4-6 6-0 |
| W | 3R | John Bryan Decasa Otico | 6-4 6-4 |
| L | QF | Benard Bruno Nkomba | 1-6 6-7 |
2017 J1 NONTHABURI
| L | 1R | Len Schouten | 4-6 4-6 |
2017 J3 SHENZHEN
| W | 1R | Xiaoyu He | 6-3 6-1 |
| W | 2R | Xiaoyang Zhang | 7-5 6-4 |
| L | QF | Ki Lung Ng | 7-6 1-6 1-6 |
2017 J3 AUCKLAND
| W | 1R | Jayden Court | 7-6 6-2 |
| W | 2R | Julian Lewis | 6-0 6-3 |
| W | 3R | Alexander Crnokrak | 3-6 6-4 7-5 |
| L | QF | Finn Reynolds | 6-1 6-7 0-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 14549, Number of registered players: 7,577, Number of registered results: 451,713