Jonas Forejtek
2019
| Us Open Junior | [4] | Win |
| Wimbledon Junior | [2] | 1R |
| Roland Garros Junior | [2] | 3R |
| Australian Open Junior | [8] | 3R |
2018
Nation
CZE
Age
24 years old (born in 2001)
World Ranking
ATP Ranking　647th
Year-end Junior World Ranking
- Year-end 2019 3th
- Year-end 2018 26th
Match Details
2019 Us Open Junior
| W | 1R | Zachary Svajda | 6-3 6-3 |
| W | 2R | Luca Nardi | 6-3 6-2 |
| W | 3R | Peter Makk | 6-1 3-6 6-2 |
| W | QF | Milan Welte | 3-6 7-5 7-5 |
| W | SF | Brandon Nakashima | 7-6 6-3 |
| W | F | Emilio Nava | 6-7 6-0 6-2 |
2019 Wimbledon Junior
| L | 1R | James Story | 4-6 6-7 |
2019 Roland Garros Junior
| W | 1R | Eliot Spizzirri | 7-6 7-6 |
| W | 2R | Matheus Pucinelli De Almeida | 7-6 6-4 |
| L | 3R | Flavio Cobolli | 4-6 6-3 2-6 |
2019 Australian Open Junior
| W | 1R | Dane Sweeny | 6-3 6-0 |
| W | 2R | Peter Makk | 6-4 6-4 |
| L | 3R | Giulio Zeppieri | 3-6 4-6 |
2018 Us Open Junior
| W | 1R | Naoki Tajima | 6-1 6-3 |
| L | 2R | Jenson Brooksby | 1-6 2-6 |
2018 Wimbledon Junior
| L | 1R | Tristan Boyer | 6-7 7-6 4-6 |
2018 Roland Garros Junior
| L | 1R | Cannon Kingsley | 6-7 1-6 |
2018 Australian Open Junior
| L | 1R | Rinky Hijikata | 5-7 1-6 |
Junior Tennis Database is a site that summarizes the results of ITF junior tennis tournaments.
Number of registered tournaments: 5774, Number of registered players: 3,011, Number of registered results: 222,093