14‑Aug‑1989 | Cincinnati | Hard | R64 | 68 | 33 | (12)Andres Gomez [ECU] d. Masur | 6-4 6-4 | | | | | | | | | |
15‑Aug‑1988 | Cincinnati | Hard | R32 | 50 | 163 | Martin Laurendeau [CAN] d. Masur | 6-7 6-2 6-4 | | | | | | | | | |
15‑Aug‑1988 | Cincinnati | Hard | R64 | 50 | 33 | Masur d. (16)Darren Cahill [AUS] | 3-6 6-3 6-1 | | | | | | | | | |
17‑Aug‑1987 | Cincinnati | Hard | R16 | 35 | 15 | (7)Brad Gilbert [USA] d. Masur | 6-7 6-4 6-1 | | | | | | | | | |
17‑Aug‑1987 | Cincinnati | Hard | R32 | 35 | 394 | Masur d. (Q)Howard Herr [RSA] | 6-3 6-1 | | | | | | | | | |
17‑Aug‑1987 | Cincinnati | Hard | R64 | 35 | 20 | Masur d. (10)Kevin Curren [USA] | 6-3 6-2 | | | | | | | | | |
18‑Aug‑1986 | Cincinnati | Hard | R64 | 81 | 100 | Sergio Casal [ESP] d. Masur | 6-2 6-3 | | | | | | | | | |
19‑Aug‑1985 | Cincinnati | Hard | R64 | 103 | 42 | Hans Schwaier [GER] d. Masur | 7-6 6-2 | | | | | | | | | |
20‑Aug‑1984 | Cincinnati | Hard | R64 | 61 | 74 | Greg Holmes [USA] d. Masur | 6-3 4-6 6-4 | | | | | | | | | |