Head to head
1
Hard
2
3
Clay
3
0
Carpet
1
Jeff Borowiak's wins on the left · Jaime Fillol Sr.'s on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (10)
| 1979 | San Jose-2 | Carpet | R32 | Jaime Fillol Sr. | 6-2 6-4 |
| 1977 | Toronto-2 | Clay | F | Jeff Borowiak | 6-0 6-1 |
| 1975 | Caracas WCT | Hard | R16 | Jeff Borowiak | 6-1 6-2 |
| 1974 | Bretton Woods | Clay | R16 | Jeff Borowiak | 7-6 0-6 6-2 |
| 1974 | Louisville | Clay | R32 | Jaime Fillol Sr. | 7-6 4-6 6-2 |
| 1974 | Charlotte WCT | Clay | SF | Jeff Borowiak | 6-3 3-6 6-0 |
| 1974 | Orlando WCT | Hard | QF | Jaime Fillol Sr. | 4-6 6-4 7-5 |
| 1973 | Clemmons | Clay | SF | Jaime Fillol Sr. | 6-4 6-4 |
| 1973 | Washington-3 | Clay | R64 | Jaime Fillol Sr. | 6-4 7-5 |
| 1971 | Berkeley WCT | Hard | R32 | Jaime Fillol Sr. | 1-6 6-2 7-5 |
Methodology
Head-to-head totals and surface splits exclude walkovers (no match was played), which follows ATP convention — walkover meetings still appear in the match list. The momentum chart plots the running lead across all counted meetings, oldest to newest.