Mark Nielsen defeated Andrew Rueb 7-5 6-4 in the New Zealand Masters 1 round of 16 on hard. The upset overturned the form book — Andrew Rueb came in leading the head-to-head 1–0. Mark Nielsen claimed a first win over Andrew Rueb in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-04-07 | New Zealand Masters 2 | SF | hard | Andrew Rueb | 6-3 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.