5‑Nov‑1990 | Moscow | Carpet | R16 | 90 | 43 | Petr Korda [CZE] d. Gunnarsson | 6-1 6-7 6-2 | | | | | | | | | |
5‑Nov‑1990 | Moscow | Carpet | R32 | 90 | 6 | Gunnarsson d. (1)Andres Gomez [ECU] | 6-2 6-4 | | | | | | | | | |
29‑Oct‑1990 | Bergen CH | Carpet | F | 91 | 103 | Alexander Mronz [GER] d. Gunnarsson | 6-4 6-4 | | | | | | | | | |
29‑Oct‑1990 | Bergen CH | Carpet | SF | 91 | 167 | Gunnarsson d. (Q)Slava Dosedel [CZE] | 6-0 6-4 | | | | | | | | | |
29‑Oct‑1990 | Bergen CH | Carpet | QF | 91 | 992 | Gunnarsson d. (WC)Thomas Enqvist [SWE] | 6-3 6-3 | | | | | | | | | |
29‑Oct‑1990 | Bergen CH | Carpet | R16 | 91 | 148 | Gunnarsson d. Richard Krajicek [NED] | 4-6 6-3 7-6 | | | | | | | | | |
29‑Oct‑1990 | Bergen CH | Carpet | R32 | 91 | 64 | Gunnarsson d. (2)Veli Paloheimo [FIN] | 6-1 6-4 | | | | | | | | | |
22‑Oct‑1990 | Stockholm Masters | Carpet | R64 | 89 | 40 | Petr Korda [CZE] d. (Q)Gunnarsson | 4-6 6-4 7-5 | | | | | | | | | |
15‑Oct‑1990 | Vienna | Carpet | R32 | 87 | 98 | Udo Riglewski [GER] d. Gunnarsson | 7-6 3-6 7-6 | | | | | | | | | |
8‑Oct‑1990 | Berlin | Carpet | R32 | 85 | 156 | (WC)Markus Zoecke [GER] d. Gunnarsson | 6-4 6-7 6-1 | | | | | | | | | |
24‑Sep‑1990 | Basel | Hard | R32 | 83 | 57 | Luiz Mattar [BRA] d. (Q)Gunnarsson | 6-4 4-6 6-4 | | | | | | | | | |
17‑Sep‑1990 | Dijon CH | Carpet | R16 | 87 | 173 | Guillaume Raoux [FRA] d. (1)Gunnarsson | 6-3 6-3 | | | | | | | | | |
17‑Sep‑1990 | Dijon CH | Carpet | R32 | 87 | 703 | (1)Gunnarsson d. (WC)Mansour Bahrami [IRI] | 7-6 6-4 | | | | | | | | | |
10‑Sep‑1990 | Geneva | Clay | R16 | 87 | 45 | (6)Sergi Bruguera [ESP] d. Gunnarsson | 7-5 6-2 | | | | | | | | | |
10‑Sep‑1990 | Geneva | Clay | R32 | 87 | 104 | Gunnarsson d. Cassio Motta [BRA] | 6-3 3-6 6-4 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | R64 | 77 | 64 | Andrei Cherkasov [RUS] d. Gunnarsson | 6-2 5-7 6-4 | | | | | | | | | |
9‑Jul‑1990 | Bastad | Clay | R32 | 62 | 122 | David Engel [SWE] d. (7)Gunnarsson | 6-2 6-0 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R128 | 54 | 74 | Jim Pugh [USA] d. Gunnarsson | 6-3 1-6 5-7 6-3 6-4 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R128 | 49 | 76 | Mark Koevermans [NED] d. Gunnarsson | 6-3 2-6 6-7 6-3 7-5 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R16 | 65 | 17 | (10)Thomas Muster [AUT] d. Gunnarsson | 6-3 6-2 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R32 | 65 | 30 | Gunnarsson d. Sergi Bruguera [ESP] | 6-4 6-2 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R64 | 65 | 12 | Gunnarsson d. (7)Michael Chang [USA] | 6-3 6-3 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R64 | 54 | 15 | (10)Jim Courier [USA] d. Gunnarsson | 6-7 6-4 6-2 | | | | | | | | | |
30‑Apr‑1990 | Munich | Clay | R32 | 49 | 18 | (5)Carl Uwe Steeb [GER] d. Gunnarsson | 6-2 6-4 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R64 | 40 | 159 | (Q)David Engel [SWE] d. Gunnarsson | 6-0 3-0 RET | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | R32 | 39 | 45 | Goran Prpic [CRO] d. Gunnarsson | 7-6 7-5 | | | | | | | | | |
26‑Mar‑1990 | Estoril CH | Clay | R32 | 41 | 155 | Nuno Marques [POR] d. (2)Gunnarsson | 6-2 4-6 6-3 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R32 | 42 | 5 | (5)Andre Agassi [USA] d. (28)Gunnarsson | 6-1 6-3 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R64 | 42 | 60 | (28)Gunnarsson d. Milan Srejber [CZE] | 6-2 7-6 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | QF | 54 | 3 | (2)Stefan Edberg [SWE] d. Gunnarsson | 6-2 6-2 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R16 | 54 | 64 | Gunnarsson d. Jim Pugh [USA] | 6-3 4-6 6-0 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R32 | 54 | 236 | Gunnarsson d. (Q)Ken Flach [USA] | 4-6 6-3 6-2 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R64 | 54 | 11 | Gunnarsson d. (9)Mats Wilander [SWE] | 7-6 6-4 | | | | | | | | | |
19‑Feb‑1990 | Stuttgart Indoor | Carpet | R32 | 52 | 17 | (5)Emilio Sanchez [ESP] d. Gunnarsson | 6-4 6-1 | | | | | | | | | |
12‑Feb‑1990 | Brussels | Carpet | R32 | 53 | 36 | (6)Magnus Gustafsson [SWE] d. Gunnarsson | 6-2 6-2 | | | | | | | | | |
15‑Jan‑1990 | Australian Open | Hard | R128 | 27 | 243 | (Q)Stefano Pescosolido [ITA] d. Gunnarsson | 6-2 6-7 6-0 6-2 | | | | | | | | | |
8‑Jan‑1990 | Sydney Outdoor | Hard | R32 | 28 | 7 | (3)Aaron Krickstein [USA] d. Gunnarsson | 7-6 6-2 | | | | | | | | | |