Head to head
Rivalry summary
Trey Waltke and Sammy Giammalva Jr. met 2 times on the ATP tour between 1981 and 1983. Their head-to-head is level at 1–1. By surface, they are level 1–1 on hard.
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Hard
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Trey Waltke's wins on the left · Sammy Giammalva Jr.'s on the right · bar lengths share one scale
All meetings (2)
| 1983 | Las Vegas | Hard | R16 | Sammy Giammalva Jr. | 6-3 1-6 6-4 |
| 1981 | Basel | Hard | QF | Trey Waltke | 6-1 6-2 |
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.