| 15‑Aug‑1988 | Cincinnati | Hard | QF | 29 | 18 | (11)Anders Jarryd [SWE] d. (13)Hlasek | 6-7 6-3 6-3 | | | | | | | | | |
| 15‑Aug‑1988 | Cincinnati | Hard | R16 | 29 | 173 | (13)Hlasek d. Gary Muller [RSA] | 4-6 6-3 6-4 | | | | | | | | | |
| 15‑Aug‑1988 | Cincinnati | Hard | R32 | 29 | 41 | (13)Hlasek d. Ramesh Krishnan [IND] | 3-6 6-2 6-3 | | | | | | | | | |
| 15‑Aug‑1988 | Cincinnati | Hard | R64 | 29 | 57 | (13)Hlasek d. Todd Witsken [USA] | 6-1 7-6 | | | | | | | | | |
| 17‑Aug‑1987 | Cincinnati | Hard | R32 | 30 | 3 | (2)Stefan Edberg [SWE] d. Hlasek | 7-6 7-5 | | | | | | | | | |
| 17‑Aug‑1987 | Cincinnati | Hard | R64 | 30 | 66 | Hlasek d. Matt Anger [USA] | 1-6 6-2 6-2 | | | | | | | | | |
| 18‑Aug‑1986 | Cincinnati | Hard | R16 | 27 | 19 | (7)Emilio Sanchez [ESP] d. (10)Hlasek | 7-6 6-4 | | | | | | | | | |
| 18‑Aug‑1986 | Cincinnati | Hard | R32 | 27 | 74 | (10)Hlasek d. John Sadri [USA] | 6-2 6-4 | | | | | | | | | |
| 18‑Aug‑1986 | Cincinnati | Hard | R64 | 27 | 37 | (10)Hlasek d. Guy Forget [FRA] | 7-6 6-4 | | | | | | | | | |
| 19‑Aug‑1985 | Cincinnati | Hard | R32 | 45 | 53 | Tom Gullikson [USA] d. Hlasek | 7-6 6-2 | | | | | | | | | |
| 19‑Aug‑1985 | Cincinnati | Hard | R64 | 45 | 24 | Hlasek d. (11)Greg Holmes [USA] | 6-4 6-1 | | | | | | | | | |