Yeonwoo Ku
2021
| J1 ROEHAMPTON | Quarter |
2020
2019
| JAPLANTATION | [13] | 2R |
| J1 BRADENTON | [10] | 1R |
| JAMERIDA | [12] | 2R |
| JB1 SEOGWIPO | [5] | Final |
| J2 CAUSEWAYBAY | [2] | 1R |
| J1 NANJING | [7] | Quarter |
| J2 SHANGHAI | [2] | Final |
| J4 NONTHABURI-2 | [1] | Final |
| J4 NONTHABURI | [1] | Win |
| J2 TAINAN | [5] | Semi |
| J2 PLOVDIV | 2R | |
| J2 BURGAS | 2R | |
| J1 SARAWAK | 1R | |
| AUSTRALIAN OPEN JUNIOR | 1R | |
| J1 TRARALGON | 2R |
Nation
KOR
World Ranking
WTA Ranking　195th
Year-end Junior World Ranking
- Year-end 2021 431th
- Year-end 2020 70th
Rival
zhuoxuan bai (1-1)
ya yi yang (2-0)
mia repac (1-1)
Match Details
J1 ROEHAMPTON
| W | 1R | Matilda Mutavdzic | 6-3 7-5 |
| W | 2R | Sara Bejlek | 6-2 6-0 |
| W | 3R | Noma Noha Akugue | 2-6 6-3 6-1 |
| L | QF | Barbora Palicova | 6-4 2-6 3-6 |
J1 NONTHABURI
| W | 2R | Vivian Yang | 6-0 6-1 |
| L | 3R | Sijia Wei | 5-7 1-6 |
AUSTRALIAN OPEN JUNIOR
| L | 1R | Hong Yi Cody Wong | 6-4 5-7 4-6 |
J1 TRARALGON
| L | 1R | Mia Repac | 7-5 4-6 1-6 |
JAPLANTATION
| W | 1R | Charlotte Owensby | 6-1 6-2 |
| L | 2R | Skyler Marie Grace Grishuk | 3-6 3-6 |
J1 BRADENTON
| L | 1R | Victoria Hu | 6-2 0-6 0-6 |
JAMERIDA
| W | 1R | Ana Paula Naranjo Martinez Kobashi | 6-2 6-2 |
| L | 2R | Tara Malik | 3-6 6-7 |
JB1 SEOGWIPO
| W | 1R | Yifan Sun | 6-1 6-1 |
| W | 2R | Mia Repac | 2-6 6-3 6-2 |
| W | 3R | Saki Imamura | 6-2 7-6 |
| W | QF | Zhuoxuan Bai | 6-3 6-2 |
| W | SF | Ya Yi Yang | 6-4 6-2 |
| L | F | Dayeon Back | 2-6 4-6 |
J2 CAUSEWAYBAY
| L | 1R | Fangran Tian | 2-6 6-2 2-6 |
J1 NANJING
| W | 2R | Yajing Cao | 6-0 3-6 6-3 |
| W | 3R | Lunda Kumhom | 6-4 6-4 |
| L | QF | Zhuoxuan Bai | 6-4 1-6 4-6 |
J2 SHANGHAI
| W | 1R | Xin Tong Wang | 6-1 6-1 |
| W | 2R | Le Yi Liu | 6-1 6-3 |
| W | QF | Cong Ying Zhao | 6-3 6-0 |
| W | SF | Kuan Yi Lee | 6-4 3-6 6-1 |
| L | F | Jiaqi Wang | 2-6 2-6 |
J4 NONTHABURI-2
| W | 2R | Yatawee Chimcham | 4-6 6-4 6-2 |
| W | 3R | Jagmeet Kaur | 6-2 6-2 |
| W | QF | Salakthip Ounmuang | 7-5 6-0 |
| W | SF | Nevena Carton | 6-4 6-1 |
| L | F | Lanlana Tararudee | 6-3 2-6 2-6 |
J4 NONTHABURI
| W | 2R | Vineetha Mummadi | 6-2 6-0 |
| W | 3R | Yuhan Liu | 6-2 6-4 |
| W | QF | Xinyi Nong | 6-3 6-2 |
| W | SF | Tianmi Mi | 6-4 6-3 |
| W | F | Natasha Sengphrachanh | 6-1 6-7 6-3 |
J2 TAINAN
| W | 1R | Yu Hua Cheng | 6-1 6-1 |
| W | 2R | Jiaqi Huang | 6-3 4-6 6-3 |
| W | QF | Ya Yi Yang | 6-3 6-4 |
| L | SF | Jiangxue Han | 3-6 1-6 |
J2 PLOVDIV
| W | 1R | Elena Trencheva | 6-2 6-3 |
| L | 2R | Oana Smaranda Corneanu | 6-2 4-6 3-6 |
J2 BURGAS
| W | 1R | Daria Shalamanova | 6-1 6-2 |
| L | 2R | Elina Avanesyan | 2-6 2-6 |
J1 SARAWAK
| L | 1R | Supapitch Kuearum | 6-3 6-7 3-4 |
AUSTRALIAN OPEN JUNIOR
| L | 1R | Priska Madelyn Nugroho | 3-6 7-6 4-6 |
J1 TRARALGON
| W | 1R | Funa Kozaki | 6-2 6-3 |
| L | 2R | Amber Marshall | 4-6 2-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 11227, Number of registered players: 7,119, Number of registered results: 411,522