24‑Dec‑1981 | Australian Open | Grass | R64 | | 29 | (5)Kim Warwick [AUS] d. Drewett | 6-4 6-1 6-2 | | | | | | | | | |
14‑Dec‑1981 | Sydney Outdoor | Grass | R64 | 100 | | Wally Masur [AUS] d. Drewett | 4-6 7-6 7-6 | | | | | | | | | |
6‑Dec‑1981 | Brisbane CH | Grass | R16 | 100 | | Matt Mitchell [USA] d. (4)Drewett | 7-5 7-6 | | | | | | | | | |
6‑Dec‑1981 | Brisbane CH | Grass | R32 | 100 | | (4)Drewett d. John Benson [USA] | 6-4 6-3 | | | | | | | | | |
6‑Dec‑1981 | Brisbane CH | Grass | R64 | 100 | | (4)Drewett d. Drew Gitlin [USA] | 6-3 RET | | | | | | | | | |
16‑Nov‑1981 | Bangkok | Carpet | R32 | 99 | 73 | Rod Frawley [AUS] d. Drewett | 7-6 7-6 | | | | | | | | | |
9‑Nov‑1981 | Taipei | Carpet | R32 | 94 | | Chris Dunk [USA] d. Drewett | 6-3 6-2 | | | | | | | | | |
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 | | | | | | | | | |
19‑Oct‑1981 | Melbourne Indoor | Carpet | R32 | 90 | 13 | (2)Vitas Gerulaitis [USA] d. Drewett | 6-1 6-1 | | | | | | | | | |
12‑Oct‑1981 | Sydney Indoor | Hard | R32 | 80 | 1 | (1)John Mcenroe [USA] d. Drewett | 6-1 6-4 | | | | | | | | | |
5‑Oct‑1981 | Brisbane | Grass | R16 | 78 | | Brad Guan [AUS] d. Drewett | 7-6 2-6 6-3 | | | | | | | | | |
5‑Oct‑1981 | Brisbane | Grass | R32 | 78 | | Drewett d. David Dowlen [USA] | 6-1 2-6 7-5 | | | | | | | | | |
21‑Sep‑1981 | San Francisco | Carpet | R32 | 76 | 1 | (1)John Mcenroe [USA] d. Drewett | 6-0 6-1 | | | | | | | | | |
1‑Sep‑1981 | US Open | Hard | R128 | 76 | 5 | (5)Jose Luis Clerc [ARG] d. Drewett | 6-4 6-3 6-3 | | | | | | | | | |
17‑Aug‑1981 | Cincinnati | Hard | R64 | 75 | 78 | Ilie Nastase [ROU] d. Drewett | 6-1 6-1 | | | | | | | | | |
10‑Aug‑1981 | Montreal / Toronto | Hard | R16 | 85 | 9 | (7)Brian Teacher [USA] d. Drewett | 3-6 6-3 6-3 | | | | | | | | | |
10‑Aug‑1981 | Montreal / Toronto | Hard | R32 | 85 | | Drewett d. Steve Meister [USA] | 2-6 6-1 6-1 | | | | | | | | | |
10‑Aug‑1981 | Montreal / Toronto | Hard | R64 | 85 | | Drewett d. (Q)Josef Brabenec [CAN] | 7-5 7-6 | | | | | | | | | |
28‑Jul‑1981 | South Orange | Clay | QF | 97 | 49 | (4)Shlomo Glickstein [ISR] d. (6)Drewett | 4-6 7-6 6-3 | | | | | | | | | |
28‑Jul‑1981 | South Orange | Clay | R16 | 97 | | (6)Drewett d. Robert Vant Hof [USA] | 2-6 6-4 6-3 | | | | | | | | | |
28‑Jul‑1981 | South Orange | Clay | R32 | 97 | | (6)Drewett d. Carlos Castellan [ARG] | 6-3 2-6 7-6 | | | | | | | | | |
20‑Jul‑1981 | Washington | Clay | R64 | 93 | 12 | (7)Eliot Teltscher [USA] d. Drewett | 6-1 6-2 | | | | | | | | | |
13‑Jul‑1981 | Boston | Clay | R32 | 97 | | John Alexander [AUS] d. Drewett | 6-7 6-1 6-4 | | | | | | | | | |
13‑Jul‑1981 | Boston | Clay | R64 | 97 | 78 | Drewett d. Marcos Hocevar [BRA] | 7-5 6-3 | | | | | | | | | |
6‑Jul‑1981 | Newport | Grass | QF | | 91 | Hank Pfister [USA] d. Drewett | 6-4 7-6 | | | | | | | | | |
6‑Jul‑1981 | Newport | Grass | R16 | | | Drewett d. Craig Edwards [USA] | 6-3 6-4 | | | | | | | | | |
6‑Jul‑1981 | Newport | Grass | R32 | | 39 | Drewett d. (6)Tom Gullikson [USA] | 4-6 7-6 7-6 | | | | | | | | | |
22‑Jun‑1981 | Wimbledon | Grass | R32 | | 16 | (14)Wojtek Fibak [POL] d. Drewett | 7-6 6-1 3-6 3-6 6-4 | | | | | | | | | |
22‑Jun‑1981 | Wimbledon | Grass | R64 | | | Drewett d. (Q)Craig Wittus [USA] | 6-3 6-0 6-4 | | | | | | | | | |
22‑Jun‑1981 | Wimbledon | Grass | R128 | | 68 | Drewett d. Marcos Hocevar [BRA] | 7-6 4-6 6-4 6-3 | | | | | | | | | |
8‑Jun‑1981 | Queen's Club | Grass | R64 | 97 | | Dick Stockton [USA] d. Drewett | 6-3 7-6 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | SF | | | (11)Steve Meister [USA] d. (1)Drewett | 7-6 6-7 6-4 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | QF | | | (1)Drewett d. (14)Ian Harris [USA] | 6-4 6-2 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | R16 | | | (1)Drewett d. Mark Darby [USA] | 6-3 6-4 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | R32 | | | (1)Drewett d. A Aguilar [MEX] | 6-1 6-2 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | R64 | | | (1)Drewett d. Terry Bennett [USA] | 6-1 6-2 | | | | | | | | | |
30‑Mar‑1981 | Linz | Hard | R32 | | | Louk Sanders [NED] d. Drewett | 7-6 6-7 6-1 | | | | | | | | | |
23‑Mar‑1981 | Stuttgart Indoor | Hard | R32 | | | (Q)Paul Torre [FRA] d. Drewett | 7-6 6-2 | | | | | | | | | |
16‑Mar‑1981 | Nancy | Hard | R32 | 98 | 66 | (8)Shlomo Glickstein [ISR] d. Drewett | 6-4 6-4 | | | | | | | | | |
12‑Jan‑1981 | Perth CH | Grass | QF | | 98 | (3)Eddie Edwards [RSA] d. (6)Drewett | 5-7 6-2 6-4 | | | | | | | | | |
12‑Jan‑1981 | Perth CH | Grass | R16 | | | (6)Drewett d. Dale Collings [AUS] | 6-4 7-5 | | | | | | | | | |
12‑Jan‑1981 | Perth CH | Grass | R32 | | | (6)Drewett d. Wally Masur [AUS] | 7-6 6-3 | | | | | | | | | |
12‑Jan‑1981 | Perth CH | Grass | R64 | | | (6)Drewett d. Ian Chapman [AUS] | 6-4 6-3 | | | | | | | | | |
5‑Jan‑1981 | Adelaide | Grass | F | | 91 | (5)Mark Edmondson [AUS] d. Drewett | 7-5 6-2 | | | | | | | | | |
5‑Jan‑1981 | Adelaide | Grass | SF | | 98 | Drewett d. (6)Eddie Edwards [RSA] | 3-6 6-3 6-4 | | | | | | | | | |
5‑Jan‑1981 | Adelaide | Grass | QF | | | Drewett d. Chris Johnstone [AUS] | 6-3 6-3 | | | | | | | | | |
5‑Jan‑1981 | Adelaide | Grass | R16 | | | Drewett d. Ross Case [AUS] | 3-6 6-2 6-4 | | | | | | | | | |
5‑Jan‑1981 | Adelaide | Grass | R32 | | | Drewett d. Rick Fisher [USA] | 6-4 7-5 | | | | | | | | | |