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| Rank | Player | Age | Tournament |
|---|---|---|---|
| 1 | 17y 321d | Davis Cup WG1 PO: FIN vs HKG 2026 | |
| 2 | 18y 136d | Davis Cup QLS R1: GER vs PER 2026 | |
| 3 | 18y 196d | Davis Cup QLS R1: CZE vs SWE 2026 | |
| 4 | 19y 29d | Davis Cup WG1 PO: SUI vs TUN 2026 | |
| 5 | 19y 166d | Davis Cup QLS R1: NOR vs GBR 2026 | |
| 6 | 20y 192d | Davis Cup QLS R1: CRO vs DEN 2026 | |
| 7 | 20y 210d | Davis Cup QLS R1: CRO vs DEN 2026 | |
| 8 | 20y 226d | Davis Cup WG1 PO: ISR vs LTU 2026 | |
| 9 | 20y 253d | Davis Cup WG1 PO: ISR vs LTU 2026 | |
| 10 | 20y 295d | Davis Cup WG1 PO: GRE vs MEX 2026 |
