Kensuke Kobayashi
2025
| J200 TAINAN | 2R | |
| J100 CHANGHUA | Semi | |
| J60 HOKUTO | [1] | Semi |
| J100 SEOUL | 1R | |
| J100 ANDONG | 1R | |
| J300 WANJU | 3R | |
| J200 HONGKONG | 2R | |
| J100 HONGKONG | 2R | |
| J200 MIKI | 1R | |
| J100 KAWAGUCHI | [4] | Quarter |
| J60 SINGAPORE-3 | [2] | Semi |
| J30 SINGAPORE-3 | [2] | Win |
| J60 IPOH | [10] | Final |
| J60 SEREMBAN | [9] | 3R |
| J100 ALMATY-2 | 1R | |
| J100 ALMATY | 2R | |
| J60 MIKICITY-2 | [7] | Quarter |
| J60 MIKICITY | [6] | 2R |
| J30 MUNAKATA | [2] | Final |
| J60 SINGAPORE-2 | Quarter | |
| J60 HONGKONG | Quarter | |
| J60 GUANGZHOU | [11] | Quarter |
2024
| J30 GIFU | Semi | |
| J30 MATSUYAMA | [4] | Final |
| J60 HOKUTO-CITY | [7] | Quarter |
| J100 KAWAGUCHI | 1R | |
| J60 EINDHOVEN | 1R | |
| J60 HILLEGOM | 2R | |
| J60 MIKICITY-2 | 1R | |
| J60 MIKICITY | 2R | |
| J60 ULCINJ | 1R | |
| J30 SKOPJE | [5] | 2R |
| J60 SKOPJE | [12] | 2R |
| J30 NIS | [2] | 2R |
| J30 KURUME | [6] | 2R |
| J100 AUCKLAND | 3R | |
| J60 WELLINGTON | 3R | |
| J60 CHRISTCHURCH | [16] | 3R |
2023
| J30 MATSUYAMA | 1R | |
| J30 GIFU | 1R | |
| J30 CHIGASAKI | Quarter | |
| J60 YAMANASHI | 2R | |
| J30 OSAKA | 2R | |
| J100 KAWAGUCHI | 1R | |
| J60 MIKICITY | 1R | |
| J60 DEDEDO | 1R |
2022
| AI SUGIYAMA CUP | 1R | |
| J5 CHIGASAKI | 1R | |
| J5 YAMANASHI | Quarter |
Nation
JPN
Generation
Born in 2009 (15-16 years old)
World Ranking
Junior World Ranking　356th
Year-end Junior World Ranking
- Year-end 2024 851th
- Year-end 2023 1826th
- Year-end 2022 2846th
Match Details
2025 J200 TAINAN
| W | 1R | Wonmin Kim | 6-4 6-1 |
| L | 2R | Yen-Chun Wang | 5-7 2-6 |
2025 J100 CHANGHUA
| W | 1R | Weibo Huang | 6-4 6-1 |
| W | 2R | Kuan-Huai Mao | 4-6 6-1 6-1 |
| W | QF | Fedor Altukhov | 6-3 6-3 |
| L | SF | Min Hyuk Cho | 0-6 3-6 |
2025 J60 HOKUTO
| W | 1R | Luke Morgan | 6-1 6-3 |
| W | 2R | Ryota Terauchi | 5-7 6-3 6-1 |
| W | QF | Kenta Arai | 6-4 6-1 |
| L | SF | Yuta Amano | 2-6 6-3 3-6 |
2025 J100 SEOUL
| L | 1R | Juchan Hwang | 5-7 1-6 |
2025 J100 ANDONG
| L | 1R | Min Ho Ko | 2-6 3-6 |
2025 J300 WANJU
| W | 1R | Park Dohyun | 7-6 6-4 |
| W | 2R | Lyul Kim | 6-4 6-1 |
| L | 3R | Daniel Tazabekov | 1-6 4-6 |
2025 J200 HONGKONG
| W | 1R | Brian Dal Zilio | 7-5 1-6 6-4 |
| L | 2R | Kaigaoge Kang | 2-6 5-7 |
2025 J100 HONGKONG
| W | 1R | Jack Cooper | 4-2 4-1 |
| L | 2R | Kuan-Huai Mao | 2-4 1-4 |
2025 J200 MIKI
| L | 1R | Daniel Tazabekov | 5-7 4-6 |
2025 J100 KAWAGUCHI
| W | 1R | Takumi Matano | 6-0 6-1 |
| W | 2R | Tomoki Fujiwara | 6-2 6-4 |
| L | QF | Yoshihiro Sakurai | 3-6 2-6 |
2025 J60 SINGAPORE-3
| W | 1R | Joshua Hyun Dam Bang | 6-1 6-3 |
| W | 2R | Robert Dolya | 6-3 6-1 |
| W | QF | Ethan David Zapp | 6-4 6-2 |
| L | SF | Michal Ihsan Wicaksana | 4-6 1-6 |
2025 J30 SINGAPORE-3
| W | 1R | Arjan Singh Dhami | 6-0 6-1 |
| W | 2R | Itay Kilimnik | 7-6 6-2 |
| W | QF | Kwok Ting Makson Chan | 6-1 6-2 |
| W | SF | Luke Jie Xi Ho | 7-6 6-1 |
| W | F | Luke Koh | 7-6 2-6 6-2 |
2025 J60 IPOH
| W | 2R | Leo Hsu | 6-1 6-2 |
| W | 3R | Tong Liu | 6-2 6-2 |
| W | QF | Yan Lang Chen | 6-2 6-4 |
| W | SF | Sin Hang Tam | 6-3 6-4 |
| L | F | Riku Nakamoto | 2-6 5-7 |
2025 J60 SEREMBAN
| W | 2R | Nathanael Campos | 6-1 6-1 |
| L | 3R | Yanhong Li | 0-6 2-6 |
2025 J100 ALMATY-2
| L | 1R | Jan Hemetzberger | 6-4 4-6 4-6 |
2025 J100 ALMATY
| W | 1R | Rodion Traigel | 6-3 6-3 |
| L | 2R | Wonmin Kim | 2-6 1-6 |
2025 J60 MIKICITY-2
| W | 1R | Kotaro Shirota | 6-3 6-3 |
| W | 2R | Aoi Ishizaki | 7-6 6-3 |
| L | QF | Kanata Ozaki | 4-6 6-3 3-6 |
2025 J60 MIKICITY
| W | 1R | Kazunari Yshii | 6-1 6-3 |
| L | 2R | Kango Endoh | 2-6 6-3 3-6 |
2025 J30 MUNAKATA
| W | 1R | Kaito Tokukura | 6-3 0-6 6-4 |
| W | 2R | Ryo Furukawa | 7-5 7-6 |
| W | QF | Junya Kawamura | 6-7 7-5 6-2 |
| W | SF | Yuta Amano | 7-6 6-1 |
| L | F | Koki Nara | 3-6 6-3 4-10 |
2025 J60 SINGAPORE-2
| W | 1R | Michal Ihsan Wicaksana | 6-2 6-4 |
| W | 2R | Xin Zhou | 7-5 6-2 |
| L | QF | Sota Kagawa | 4-6 4-6 |
2025 J60 HONGKONG
| W | 1R | Wan Him Donovan Yim | 6-3 6-0 |
| W | 2R | Xianfeng Chen | 7-5 6-3 |
| L | QF | Sin Hang Tam | 2-6 7-6 3-6 |
2025 J60 GUANGZHOU
| W | 1R | Zecheng Pan | 6-1 6-2 |
| W | 2R | Zi Yun Gu | 6-2 7-6 |
| W | 3R | Xianfeng Chen | 6-2 6-4 |
| L | QF | Sin Hang Tam | 6-7 7-6 2-6 |
2024 J30 GIFU
| W | 1R | Jaejun Kim | 6-3 6-1 |
| W | 2R | Shotaro Yamamoto | 6-2 6-4 |
| W | QF | Daniel Yang | 6-3 6-2 |
| L | SF | Shintaro Ogaki | 3-6 4-6 |
2024 J30 MATSUYAMA
| W | 1R | Shuya Machida | 7-5 6-1 |
| W | 2R | Sora Kaneko | 7-5 6-4 |
| W | QF | Daniel Yang | 3-6 6-3 10-8 |
| W | SF | Hikaru Hieda | 7-5 6-4 |
| L | F | Yuta Amano | 1-6 4-6 |
2024 J60 HOKUTO-CITY
| W | 1R | Kyungbeen An | 6-0 6-0 |
| W | 2R | Shun Wakino | 6-2 6-3 |
| L | QF | Yoshihiro Sakurai | 3-6 6-1 3-6 |
2024 J100 KAWAGUCHI
| L | 1R | Wenbo Bai | 3-6 4-6 |
2024 J60 EINDHOVEN
| L | 1R | Stefan Mos | 4-6 2-6 |
2024 J60 HILLEGOM
| W | 1R | Boris Van Ruiten | 1-6 7-5 6-2 |
| L | 2R | Timothee Andriveau | 2-6 3-6 |
2024 J60 MIKICITY-2
| L | 1R | Yuta Dokai | 4-6 4-6 |
2024 J60 MIKICITY
| W | 1R | Sota Kagawa | 6-2 6-4 |
| L | 2R | Kanata Ozaki | 3-6 0-6 |
2024 J60 ULCINJ
| L | 1R | Andrej Paunovic | 6-1 6-7 3-6 |
2024 J30 SKOPJE
| W | 1R | Maksimilijan Aleksovski | 6-1 6-4 |
| L | 2R | Ognjen Jagrovic | 2-6 7-6 4-6 |
2024 J60 SKOPJE
| L | 2R | Jovan Tomovic | 2-6 3-6 |
2024 J30 NIS
| W | 1R | Egor Zakharov | 6-0 1-0 |
| L | 2R | Kristian Vukovic | 1-6 4-6 |
2024 J30 KURUME
| W | 1R | Kanari Izumisawa | 6-3 6-2 |
| L | 2R | Ryuto Suzuki | 3-6 3-6 |
2024 J100 AUCKLAND
| W | 1R | Flynn Coventry-Searle | 7-5 6-3 |
| W | 2R | Josh Hinton | 6-3 6-0 |
| L | 3R | Kai Milburn | 4-6 2-6 |
2024 J60 WELLINGTON
| W | 1R | Lachlan King | 6-4 7-5 |
| W | 2R | Jacob Kailiang Shen | 6-2 6-2 |
| L | 3R | Alex Morris | 1-6 3-6 |
2024 J60 CHRISTCHURCH
| W | 2R | Chan Min | 7-6 6-0 |
| L | 3R | Jonty Giesen | 1-6 4-6 |
2023 J30 MATSUYAMA
| L | 1R | Taku Ito | 3-6 5-7 |
2023 J30 GIFU
| L | 1R | Kenta Kawada | 3-6 3-6 |
2023 J30 CHIGASAKI
| W | 1R | Riu Takahashi | 6-1 6-2 |
| W | 2R | Shun Wakino | 6-4 6-1 |
| L | QF | Koshiro Nakamae | 1-6 0-6 |
2023 J60 YAMANASHI
| W | 1R | Kohei Konishi | 6-4 6-3 |
| L | 2R | Eito Komada | 2-6 3-6 |
2023 J30 OSAKA
| W | 1R | Ryohei Nishino | 6-1 6-1 |
| L | 2R | Hikaru Takahashi | 3-6 2-6 |
2023 J100 KAWAGUCHI
| L | 1R | Rohan Belday | 1-6 1-6 |
2023 J60 MIKICITY
| L | 1R | Hakuto Imanishi | 4-6 1-6 |
2023 J60 DEDEDO
| L | 1R | Juan Kim | 4-6 2-6 |
2022 AI SUGIYAMA CUP
| L | 1R | Yuto Oki | 4-6 3-6 |
2022 J5 CHIGASAKI
| L | 1R | Yuto Oki | 4-6 3-6 |
2022 J5 YAMANASHI
| W | 1R | Sora Otani | 6-2 6-0 |
| W | 2R | Christopher Kosei Ono | 6-1 2-6 6-0 |
| L | QF | Natsuki Yamamoto | 2-6 1-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 10179, Number of registered players: 6,443, Number of registered results: 375,166