Bong-Soo Kim has been dominant on clay, posting 8–1 across 9 matches (88.9% — exceptional). Few players in the Open Era have sustained that level of dominance across a full career on clay.

By format on clay — best-of-five: 5–1 (83.3%); best-of-three: 3–0 (100.0%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.

Bong-Soo Kim recorded a notable 6-match winning streak on clay — a run that demonstrates consistency across consecutive draws on this surface.