Gustavo Cavallaro defeated Lucas Arnold Ker 6-2 6-3 in the Argentina B Masters 4 qualifying round on clay. The upset overturned the form book — Lucas Arnold Ker came in leading the head-to-head 2–1. Gustavo Cavallaro narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1995-04-01 | Argentina 1 Masters 4 | R16 | clay | Gustavo Cavallaro | 6-2 1-0 |
| 1994-08-13 | Argentina 3 Masters 3 | QF | clay | Lucas Arnold Ker | 6-2 3-6 6-1 |
| 1993-07-17 | Argentina 2 Masters 1 | R16 | clay | Lucas Arnold Ker | 6-3 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.