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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 16y 249d | Davis Cup WG1 PO: SLO vs TUR 2026 | |
| 2 | 16y 281d | Davis Cup QLS R1: ECU vs AUS 2026 | |
| 3 | 17y 106d | Davis Cup QLS R1: BUL vs BEL 2026 | |
| 4 | 18y 99d | Davis Cup WG1 PO: PAR vs ROU 2026 | |
| 5 | 18y 184d | Davis Cup WG1 PO: PAR vs ROU 2026 | |
| 6 | 18y 238d | Davis Cup QLS R1: CHI vs SRB 2026 | |
| 7 | 18y 276d | Davis Cup QLS R1: BUL vs BEL 2026 | |
| 8 | MARReda Bennani | 18y 363d | Davis Cup WG1 PO: MAR vs COL 2026 |
| 9 | 19y 335d | Davis Cup WG1 PO: PAR vs ROU 2026 | |
| 10 | 20y 248d | Davis Cup QLS R1: BUL vs BEL 2026 |
