Head to head
0
Hard
2
1
Clay
0
0
Carpet
3
Jan Gunnarsson's wins on the left · Jakob Hlasek's on the right · bar lengths share one scale
Momentum
Running lead across all meetings, oldest to newest (walkovers excluded).
All meetings (6)
| 1991 | Basel | Hard | R32 | Jakob Hlasek | 6-3 6-2 |
| 1991 | Milan | Carpet | QF | Jakob Hlasek | 6-0 7-6(5) |
| 1988 | Toulouse | Hard | R32 | Jakob Hlasek | 6-4 6-4 |
| 1987 | Wembley | Carpet | R16 | Jakob Hlasek | 7-5 6-0 |
| 1987 | Stuttgart | Clay | QF | Jan Gunnarsson | 6-4 6-4 |
| 1986 | Philadelphia | Carpet | R32 | Jakob Hlasek | 6-2 6-4 |
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.