Lawson Duncan has a competitive clay court record of 93–79 across 172 matches (54.1%). The record shows a player capable of competing here, though there is clear room to push the win rate higher. Lawson Duncan has reached 6 finals without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): Lawson Duncan is 5–5 (50.0%) across 10 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

6 finals reached on clay — none converted into a title yet. Reaching 6 finals is a mark of real quality, but the gap between finalist and champion is one of the finest lines in the sport. 11 semifinals. 21 quarterfinals.

vs. Top 10 on clay: 0–8 (0.0%, 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: 5–5 (50.0%); best-of-three: 88–74 (54.3%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Peak season: 1985 — 25–15 (62.5%) from 40 matches. That year captures the ceiling of what Lawson Duncan can do on clay when performing at their best and represents the standard to aim for.