Matthias Muller defeated Helge Koll 6-0 6-3 in the Iran Masters 3 qualifying round on clay. The upset overturned the form book — Helge Koll came in leading the head-to-head 1–0. Matthias Muller claimed a first win over Helge Koll in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-01-04 | France 1 Masters 3 | R32 | clay | Helge Koll | 6-2 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.