Timo Nigri defeated Mattias Pennonen 7-5 6-4 in the Iran Masters 1 round of 32 on clay. The upset overturned the form book — Mattias Pennonen came in leading the head-to-head 1–0. Timo Nigri claimed a first win over Mattias Pennonen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1997-06-27 | Denmark Masters 1 | R32 | clay | Mattias Pennonen | 6-2 7-6 |