Zeljko Franulovic holds a solid clay court record of 305–167 across 472 matches (64.6%). A winning majority across 472 matches shows consistent ability to get results on clay. With 11 titles, among the most prolific clay court champions in the Open Era: St. Petersburg, Houston, Indianapolis, Barranquilla and 5 more.

At Grand Slam level (Roland Garros): a positive 31–18 (63.3%) across 49 matches — a player who generally rises to the occasion at the Slams on clay.

17 finals reached on clay — won 11, lost 6 (solid 65% conversion) — consistently getting to finals and winning the majority is a hallmark of elite performers on clay. 33 semifinals. 66 quarterfinals.

vs. Top 10 on clay: 4–26 (13.3%, 30 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: 80–35 (69.6%); best-of-three: 225–132 (63.0%). Slightly better in five-set matches on clay — a positive sign for the Slams specifically.

Dominant season: 1970 — 48–10 (82.8%) from 58 matches. A campaign of 48 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.