Butch Walts has a competitive clay court record of 19–21 across 40 matches (47.5%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Claimed 1 title on clay: Boca Raton.

At Grand Slam level (Roland Garros): Butch Walts is 3–3 (50.0%) across 6 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

One final reached on clay, converted into a title — a perfect finals record on this surface. 1 semifinal. 2 quarterfinals.

vs. Top 10 on clay: 0–7 (0.0%, 7 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.

Best season: 1976 — 6–2 (75.0%) from 8 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.

Butch Walts recorded a notable 5-match winning streak on clay — a run that demonstrates consistency across consecutive draws on this surface.