26‑Oct‑1987 | Hong Kong | Hard | R32 | 152 | 101 | John Fitzgerald [AUS] d. Drewett | 6-2 1-6 6-4 | | | | | | | | | |
27‑Oct‑1986 | Hong Kong | Hard | R32 | 159 | 76 | Bud Schultz [USA] d. (Q)Drewett | 2-6 7-5 6-2 | | | | | | | | | |
18‑Nov‑1985 | Hong Kong | Hard | R32 | 116 | 38 | (8)John Sadri [USA] d. Drewett | 6-4 3-6 6-3 | | | | | | | | | |
22‑Oct‑1984 | Hong Kong | Hard | R32 | 81 | 107 | Steve Meister [USA] d. Drewett | 3-6 6-3 7-5 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | R16 | 80 | 48 | Sammy Giammalva Jr [USA] d. Drewett | 6-2 6-3 | | | | | | | | | |
31‑Oct‑1983 | Hong Kong | Hard | R32 | 80 | | Drewett d. (Q)Andy Andrews [USA] | 2-6 6-1 6-0 | | | | | | | | | |
1‑Nov‑1982 | Hong Kong | Hard | R32 | | | Mike Bauer [USA] d. Drewett | 3-6 6-4 7-6 | | | | | | | | | |
2‑Nov‑1981 | Hong Kong | Hard | R16 | 93 | 34 | (5)Mark Edmondson [AUS] d. Drewett | 6-0 6-2 | | | | | | | | | |
2‑Nov‑1981 | Hong Kong | Hard | R32 | 93 | 68 | Drewett d. Ramesh Krishnan [IND] | 6-2 4-6 6-3 | | | | | | | | | |
5‑Nov‑1979 | Hong Kong | Hard | R16 | 79 | 32 | (4)Buster C Mottram [GBR] d. Drewett | 6-3 3-6 6-3 | | | | | | | | | |
5‑Nov‑1979 | Hong Kong | Hard | R32 | 79 | | Drewett d. Stefan Simonsson [SWE] | 6-7 7-6 6-1 | | | | | | | | | |