Birger Andersson has found clay courts difficult, recording 29–51 across 80 matches (36.3%). The numbers point to a surface that has not consistently suited the game — a key area of opportunity on the calendar. Claimed 1 title on clay: Algiers.

At Grand Slam level (Roland Garros): Birger Andersson has yet to record a win on clay at this stage — 0–4 across 4 Grand Slam matches. Breaking through here would mark a significant step forward on this surface.

One final reached on clay, converted into a title — a perfect finals record on this surface. 2 semifinals. 3 quarterfinals.

vs. Top 10 on clay: 0–3 (0.0%, 3 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: 6–10 (37.5%); best-of-three: 23–41 (35.9%). Consistent regardless of format on clay — a sign of a well-rounded game that holds up as matches develop.

Best season: 1980 — 3–2 (60.0%) from 5 matches. The best single-season display to date — a useful reference point as the clay record continues to develop.