Head to head
Rivalry summary
Willem Prinsloo and Jeff Borowiak met 2 times on the ATP tour between 1977 and 1977. Their head-to-head is level at 1–1. By surface, they are level 1–1 on clay.
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Clay
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Willem Prinsloo's wins on the left · Jeff Borowiak's on the right · bar lengths share one scale
All meetings (2)
| 1977 | US Open | Clay | R128 | Willem Prinsloo | 3-6 7-6 6-1 |
| 1977 | Gstaad | Clay | R32 | Jeff Borowiak | 6-1 6-3 |
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.