Jason Stoltenberg holds a solid clay court record of 59–43 across 102 matches (57.8%). A winning majority across 102 matches shows consistent ability to get results on clay. Claimed 3 titles on clay: Birmingham, Coral Springs.

At Grand Slam level (Roland Garros): Jason Stoltenberg is 10–11 (47.6%) across 21 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

ATP Masters 1000 on clay (Monte Carlo, Madrid, Rome): Jason Stoltenberg has struggled at Masters level on clay: 1–2 (33.3%) in 3 matches. Improving at this level is the clearest path to a stronger overall record on this surface.

6 finals reached on clay — won 3, lost 3 (solid 50% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on clay. 9 semifinals. 12 quarterfinals.

vs. Top 10 on clay: 3–5 (37.5%, 8 matches). Top 10 opponents have represented a clear ceiling on clay; addressing that deficit is the single biggest lever for improving the overall record here.

By format on clay — best-of-five: 11–13 (45.8%); best-of-three: 48–30 (61.5%). Markedly stronger in three-set formats; the win rate drops noticeably in five-setters, which has direct implications for Grand Slam performance on clay.

Best season: 1997 — 13–3 (81.3%) from 16 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.