Pierre Barthes holds a solid clay court record of 77–60 across 137 matches (56.2%). A winning majority across 137 matches shows consistent ability to get results on clay. Pierre Barthes has reached 2 finals without yet claiming a title on clay — one of the finest margins in tennis.

At Grand Slam level (Roland Garros): Pierre Barthes is 9–7 (56.3%) across 16 Grand Slam matches — below .500, though the elite draw depth at the Slams makes that a notoriously difficult barrier to crack.

2 finals reached on clay — none converted into a title yet. Reaching 2 finals is a mark of real quality, but the gap between finalist and champion is one of the finest lines in the sport. 5 semifinals. 18 quarterfinals.

By format on clay — best-of-five: 29–27 (51.8%); best-of-three: 48–33 (59.3%). Slightly stronger in three-set contests on clay, though the five-set record is still respectable.

Dominant season: 1971 — 31–11 (73.8%) from 42 matches. A campaign of 31 wins on clay in a single season is among the best single-season records the surface has seen — the clearest benchmark of what is achievable at peak level.