24‑Dec‑1981 | Australian Open | Grass | R32 | | 6 | (1)Guillermo Vilas [ARG] d. Stefanki | 6-7 6-3 6-4 6-4 | | | | | | | | | |
24‑Dec‑1981 | Australian Open | Grass | R64 | | | Stefanki d. (Q)Wally Masur [AUS] | 4-6 6-4 2-6 6-2 7-6 | | | | | | | | | |
23‑Nov‑1981 | Manila | Clay | R16 | | | Mike Bauer [USA] d. (6)Stefanki | 6-4 6-0 | | | | | | | | | |
23‑Nov‑1981 | Manila | Clay | R32 | | | (6)Stefanki d. Alvin Gardiner [AUS] | 6-4 7-5 | | | | | | | | | |
16‑Nov‑1981 | Bangkok | Carpet | R32 | | 20 | (1)Vijay Amritraj [IND] d. Stefanki | 6-4 6-3 | | | | | | | | | |
9‑Nov‑1981 | Taipei | Carpet | R16 | | 51 | (8)Tim Gullikson [USA] d. Stefanki | 6-4 6-0 | | | | | | | | | |
9‑Nov‑1981 | Taipei | Carpet | R32 | | | Stefanki d. Hans Kary [AUT] | 7-5 7-6 | | | | | | | | | |
2‑Nov‑1981 | Hong Kong | Hard | R32 | | | Chris Mayotte [USA] d. Stefanki | 7-6 6-2 | | | | | | | | | |
19‑Oct‑1981 | Tokyo Outdoor | Clay | R16 | | 54 | (8)Terry Moor [USA] d. (14)Stefanki | 7-5 6-4 | | | | | | | | | |
19‑Oct‑1981 | Tokyo Outdoor | Clay | R32 | | | (14)Stefanki d. (Q)Taisen Kanai [JPN] | 6-0 6-3 | | | | | | | | | |
19‑Oct‑1981 | Tokyo Outdoor | Clay | R64 | | | (14)Stefanki d. Nobuya Tamura [JPN] | 6-1 6-1 | | | | | | | | | |
29‑Sep‑1981 | Maui | Hard | R16 | | 74 | Hank Pfister [USA] d. Stefanki | 7-6 6-4 | | | | | | | | | |
29‑Sep‑1981 | Maui | Hard | R32 | | | Stefanki d. Lloyd Bourne [USA] | 7-5 4-6 6-3 | | | | | | | | | |
21‑Sep‑1981 | San Francisco | Carpet | R64 | | | Scott Mccain [USA] d. Stefanki | 7-6 6-7 7-6 | | | | | | | | | |
1‑Sep‑1981 | US Open | Hard | R64 | | 2 | (2)Bjorn Borg [SWE] d. Stefanki | 6-4 6-4 6-4 | | | | | | | | | |
1‑Sep‑1981 | US Open | Hard | R128 | | 53 | Stefanki d. Phil Dent [AUS] | 6-7 7-5 6-4 3-6 6-3 | | | | | | | | | |
17‑Aug‑1981 | Cincinnati | Hard | R64 | | 84 | Christophe Roger Vasselin [FRA] d. (LL)Stefanki | 6-4 6-2 | | | | | | | | | |
10‑Aug‑1981 | Stowe | Hard | QF | | | Marko Ostoja [CRO] d. Stefanki | 6-1 7-6 | | | | | | | | | |
10‑Aug‑1981 | Stowe | Hard | R16 | | | Stefanki d. Charles Buzz Strode [USA] | 6-3 6-1 | | | | | | | | | |
10‑Aug‑1981 | Stowe | Hard | R32 | | | Stefanki d. Jonathan Smith [GBR] | 6-3 6-3 | | | | | | | | | |
28‑Jul‑1981 | South Orange | Clay | R32 | | | (Q)John James [AUS] d. Stefanki | 6-4 6-4 | | | | | | | | | |
6‑Jul‑1981 | Newport | Grass | R32 | | | Beejong Sisson [PHI] d. Stefanki | 6-2 6-2 | | | | | | | | | |
22‑Jun‑1981 | Wimbledon | Grass | R128 | | | (Q)Cliff Letcher [AUS] d. Stefanki | 6-1 7-6 6-3 | | | | | | | | | |
8‑Jun‑1981 | Queen's Club | Grass | R64 | | 58 | Nick Saviano [USA] d. Stefanki | 6-4 2-6 6-4 | | | | | | | | | |
25‑May‑1981 | Roland Garros | Clay | R128 | | | Chris Johnstone [AUS] d. Stefanki | 6-1 7-5 6-0 | | | | | | | | | |
4‑May‑1981 | Forest Hills WCT | Clay | R16 | | 18 | (9)Balazs Taroczy [HUN] d. Stefanki | 6-3 6-4 | | | | | | | | | |
4‑May‑1981 | Forest Hills WCT | Clay | R32 | | 17 | Stefanki d. (8)Adriano Panatta [ITA] | DEF | | | | | | | | | |
4‑May‑1981 | Forest Hills WCT | Clay | R64 | | | Stefanki d. Craig Wittus [USA] | 6-2 2-6 7-5 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | R32 | | | Roberto Chavez [MEX] d. (3)Stefanki | 6-4 7-6 | | | | | | | | | |
13‑Apr‑1981 | San Luis Potosi CH | Clay | R64 | | | (3)Stefanki d. Jeff Lee [USA] | 6-4 6-4 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | F | | | Stefanki d. (1)Peter Feigl [AUT] | 5-7 6-3 6-0 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | SF | | | Stefanki d. Robert Reininger [AUT] | 6-7 7-5 6-4 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | QF | | | Stefanki d. (Q)Marzio Miloro [ITA] | 6-2 6-2 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | R16 | | | Stefanki d. Jan Kodes [CZE] | 6-0 6-3 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | R32 | | | Stefanki d. (4)Steve Docherty [AUS] | 6-4 6-3 | | | | | | | | | |
5‑Jan‑1981 | Auckland | Hard | R16 | | 95 | (5)Tim Wilkison [USA] d. Stefanki | 7-5 6-3 | | | | | | | | | |
5‑Jan‑1981 | Auckland | Hard | R32 | | | Stefanki d. Tom Cain [USA] | 6-2 4-0 RET | | | | | | | | | |