16‑Nov‑1981 | Bangkok | Carpet | R32 | | | Jonathan Smith [GBR] d. Feigl | 7-6 6-0 | | | | | | | | | |
9‑Nov‑1981 | Taipei | Carpet | R32 | | | Marty Davis [USA] d. Feigl | 6-3 3-6 6-2 | | | | | | | | | |
2‑Nov‑1981 | Hong Kong | Hard | R32 | | 83 | Van Winitsky [USA] d. Feigl | 6-2 7-6 | | | | | | | | | |
19‑Oct‑1981 | Vienna | Hard | R32 | | 25 | (3)Stan Smith [USA] d. Feigl | 6-3 6-1 | | | | | | | | | |
19‑Oct‑1981 | Vienna | Hard | R64 | | | Feigl d. Chris Mayotte [USA] | 6-3 6-3 | | | | | | | | | |
12‑Oct‑1981 | Basel | Hard | R32 | | | Jay Lapidus [USA] d. Feigl | 6-2 6-4 | | | | | | | | | |
5‑Oct‑1981 | Tel Aviv | Hard | R16 | | 84 | (5)Per Hjertquist [SWE] d. Feigl | 5-7 6-4 6-3 | | | | | | | | | |
5‑Oct‑1981 | Tel Aviv | Hard | R32 | | | Feigl d. Steve Meister [USA] | 1-6 6-4 6-4 | | | | | | | | | |
17‑Aug‑1981 | Cincinnati | Hard | R64 | | | Rick Fagel [USA] d. Feigl | 6-4 3-6 6-2 | | | | | | | | | |
10‑Aug‑1981 | Montreal / Toronto | Hard | R32 | | 39 | (13)Tom Gullikson [USA] d. Feigl | 5-7 6-1 6-4 | | | | | | | | | |
10‑Aug‑1981 | Montreal / Toronto | Hard | R64 | | | Feigl d. Rick Fagel [USA] | 7-6 6-2 | | | | | | | | | |
3‑Aug‑1981 | Indianapolis | Clay | R64 | | | Gilles Moretton [FRA] d. Feigl | 2-6 7-5 6-2 | | | | | | | | | |
27‑Jul‑1981 | Zell Am See CH | Clay | R32 | | | Ramiro Benavides [BOL] d. (7)Feigl | 6-2 3-6 6-3 | | | | | | | | | |
13‑Jul‑1981 | Kitzbuhel | Clay | R64 | | | Pavel Hutka [CZE] d. (15)Feigl | 7-5 6-4 | | | | | | | | | |
22‑Jun‑1981 | Wimbledon | Grass | R128 | | 35 | Victor Amaya [USA] d. Feigl | 6-4 7-6 6-7 7-6 | | | | | | | | | |
12‑Jun‑1981 | Davis Cup EUR QF: AUT vs DEN | Clay | RR | 89 | | Feigl d. Michael Mortensen [DEN] | 6-3 10-8 6-3 | | | | | | | | | |
12‑Jun‑1981 | Davis Cup EUR QF: AUT vs DEN | Clay | RR | 89 | | Peter Bastiansen [DEN] d. Feigl | 6-4 2-6 6-4 7-5 | | | | | | | | | |
25‑May‑1981 | Roland Garros | Clay | R128 | 86 | | Eric Fromm [USA] d. Feigl | 6-7 7-5 6-2 6-3 | | | | | | | | | |
18‑May‑1981 | Munich | Clay | R16 | 91 | 34 | (2)Rolf Gehring [GER] d. Feigl | 6-3 6-3 | | | | | | | | | |
18‑May‑1981 | Munich | Clay | R32 | 91 | | Feigl d. Andrew Pattison [USA] | 6-2 6-1 | | | | | | | | | |
6‑Apr‑1981 | Johannesburg | Hard | SF | | 56 | (1)Kevin Curren [USA] d. (6)Feigl | 6-4 6-2 | | | | | | | | | |
6‑Apr‑1981 | Johannesburg | Hard | QF | | | (6)Feigl d. Deon Joubert [RSA] | 2-6 6-3 6-3 | | | | | | | | | |
6‑Apr‑1981 | Johannesburg | Hard | R16 | | | (6)Feigl d. Leo Palin [FIN] | 6-2 4-6 6-3 | | | | | | | | | |
6‑Apr‑1981 | Johannesburg | Hard | R32 | | | (6)Feigl d. Nigel Sears [GBR] | 6-0 6-2 | | | | | | | | | |
30‑Mar‑1981 | Linz | Hard | R16 | | | Bernard Boileau [BEL] d. (8)Feigl | 5-7 6-1 6-2 | | | | | | | | | |
30‑Mar‑1981 | Linz | Hard | R32 | | | (8)Feigl d. Cassio Motta [BRA] | 3-6 6-2 6-4 | | | | | | | | | |
23‑Mar‑1981 | Stuttgart Indoor | Hard | R32 | | 99 | Jan Norback [SWE] d. Feigl | 6-3 6-4 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | F | | | Larry Stefanki [USA] d. (1)Feigl | 5-7 6-3 6-0 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | SF | | | (1)Feigl d. Marco Bellini [ITA] | 6-1 6-4 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | QF | | | (1)Feigl d. Craig Wittus [USA] | 6-1 6-3 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | R16 | | | (1)Feigl d. Roland Steigler [AUT] | 6-2 7-6 | | | | | | | | | |
2‑Mar‑1981 | Lagos CH | Hard | R32 | | | (1)Feigl d. Bullus Hussaini [NGR] | 7-5 6-2 | | | | | | | | | |
2‑Feb‑1981 | Richmond WCT | Carpet | R16 | | 6 | (2)Ivan Lendl [USA] d. (Q)Feigl | 6-1 7-6 | | | | | | | | | |
2‑Feb‑1981 | Richmond WCT | Carpet | R32 | | 57 | (Q)Feigl d. Andrew Pattison [USA] | 6-2 6-0 | | | | | | | | | |
26‑Jan‑1981 | Philadelphia | Carpet | R32 | | 3 | (1)Jimmy Connors [USA] d. Feigl | 7-5 4-6 6-4 | | | | | | | | | |
19‑Jan‑1981 | San Juan | Hard | R32 | 86 | | Sashi Menon [IND] d. (5)Feigl | 3-6 6-2 7-6 | | | | | | | | | |