Donald Johnson defeated Richard Whichello 7-5 7-6 in the Spain 5 Masters 3 qualifying round on clay. The upset overturned the form book — Richard Whichello came in leading the head-to-head 1–0. Donald Johnson claimed a first win over Richard Whichello in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-06-15 | Spain 6 Masters 1 | R32 | clay | Richard Whichello | 6-3 6-7 7-6 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.