Head to head
Rivalry summary
Billy Harris and Gabriel Diallo met 2 times on the ATP tour between 2024 and 2025. Their head-to-head is level at 1–1. By surface, they are level 1–1 on grass.
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Grass
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Billy Harris's wins on the left · Gabriel Diallo's on the right · bar lengths share one scale
All meetings (2)
| 2025 | Queen's Club | Grass | R32 | Gabriel Diallo | 6-1 3-6 6-4 |
| 2024 | Newport | Grass | R32 | Billy Harris | 7-6(4) 7-5 |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.