5‑Nov‑1990 | Itaparica | Hard | R16 | 39 | 104 | Cassio Motta [BRA] d. (6)Mattar | 6-1 2-6 7-5 | | | | | | | | | |
5‑Nov‑1990 | Itaparica | Hard | R32 | 39 | 108 | (6)Mattar d. Roberto Azar [ARG] | 6-3 4-6 7-5 | | | | | | | | | |
29‑Oct‑1990 | Rio De Janeiro CH | Hard | F | 44 | 127 | (1)Mattar d. Luis Herrera [MEX] | 6-3 3-6 6-3 | | | | | | | | | |
29‑Oct‑1990 | Rio De Janeiro CH | Hard | SF | 44 | 126 | (1)Mattar d. Nuno Marques [POR] | 6-3 2-6 6-2 | | | | | | | | | |
29‑Oct‑1990 | Rio De Janeiro CH | Hard | QF | 44 | 252 | (1)Mattar d. (Q)Roger Smith [BAH] | 7-6 6-7 7-5 | | | | | | | | | |
29‑Oct‑1990 | Rio De Janeiro CH | Hard | R16 | 44 | 135 | (1)Mattar d. Jaime Oncins [BRA] | 6-3 7-6 | | | | | | | | | |
29‑Oct‑1990 | Rio De Janeiro CH | Hard | R32 | 44 | 155 | (1)Mattar d. Martin Wostenholme [CAN] | 6-3 6-4 | | | | | | | | | |
22‑Oct‑1990 | Sao Paulo | Carpet | QF | 45 | 209 | (WC)Danilo Marcelino [BRA] d. (2)Mattar | 6-7 6-2 7-6 | | | | | | | | | |
22‑Oct‑1990 | Sao Paulo | Carpet | R16 | 45 | 162 | (2)Mattar d. Bruno Oresar [CRO] | 7-5 2-6 6-4 | | | | | | | | | |
22‑Oct‑1990 | Sao Paulo | Carpet | R32 | 45 | 147 | (2)Mattar d. Pablo Arraya [PER] | 6-3 6-2 | | | | | | | | | |
8‑Oct‑1990 | Berlin | Carpet | SF | 54 | 43 | (8)Alexander Volkov [RUS] d. Mattar | 6-3 6-2 | | | | | | | | | |
8‑Oct‑1990 | Berlin | Carpet | QF | 54 | 53 | Mattar d. Jean Philippe Fleurian [FRA] | 7-6 6-4 | | | | | | | | | |
8‑Oct‑1990 | Berlin | Carpet | R16 | 54 | 25 | Mattar d. (4)Horst Skoff [AUT] | 6-1 4-6 6-3 | | | | | | | | | |
8‑Oct‑1990 | Berlin | Carpet | R32 | 54 | 543 | Mattar d. (WC)Jan Kodes Jr [CZE] | 6-3 6-1 | | | | | | | | | |
1‑Oct‑1990 | Toulouse | Hard | R32 | 50 | 20 | (4)Jonas Svensson [SWE] d. Mattar | 6-2 3-6 6-4 | | | | | | | | | |
24‑Sep‑1990 | Basel | Hard | R16 | 57 | 24 | (6)Magnus Gustafsson [SWE] d. Mattar | 6-7 7-6 6-4 | | | | | | | | | |
24‑Sep‑1990 | Basel | Hard | R32 | 57 | 83 | 6-4 4-6 6-4 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R32 | 66 | 40 | Christo Van Rensburg [RSA] d. Mattar | 6-1 6-4 5-7 6-4 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R64 | 66 | 71 | Mattar d. Veli Paloheimo [FIN] | 6-4 6-0 3-6 2-6 6-3 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R128 | 66 | 5 | Mattar d. (5)Andres Gomez [ECU] | 6-3 3-6 6-3 6-3 | | | | | | | | | |
13‑Aug‑1990 | Brasilia2 CH | Hard | R64 | 59 | 277 | Nelson Aerts [BRA] d. (1)Mattar | 3-6 6-4 6-4 | | | | | | | | | |
30‑Jul‑1990 | Lins CH | Clay | SF | 55 | 197 | (3)Pedro Rebolledo [CHI] d. (1)Mattar | 6-2 6-2 | | | | | | | | | |
30‑Jul‑1990 | Lins CH | Clay | QF | 55 | 312 | (1)Mattar d. (WC)Nelson Aerts [BRA] | 6-2 6-2 | | | | | | | | | |
30‑Jul‑1990 | Lins CH | Clay | R16 | 55 | 412 | (1)Mattar d. (Q)Fernando Meligeni [BRA] | 6-3 6-3 | | | | | | | | | |
30‑Jul‑1990 | Lins CH | Clay | R32 | 55 | 343 | (1)Mattar d. (Q)Marcos Perez Hubert [ESP] | 6-2 6-2 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | R32 | 54 | 5 | (1)Andres Gomez [ECU] d. Mattar | 7-5 6-4 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | R64 | 54 | 188 | Mattar d. (WC)Martin Sinner [GER] | 6-3 6-7 7-5 | | | | | | | | | |
9‑Jul‑1990 | Gstaad | Clay | R32 | 53 | 47 | Jordi Arrese [ESP] d. Mattar | 7-5 6-4 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R128 | 51 | 196 | (Q)Shuzo Matsuoka [JPN] d. Mattar | 7-6 6-3 6-4 | | | | | | | | | |
18‑Jun‑1990 | Genova | Clay | QF | 52 | 68 | Omar Camporese [ITA] d. (5)Mattar | 6-1 6-1 | | | | | | | | | |
18‑Jun‑1990 | Genova | Clay | R16 | 52 | 168 | (5)Mattar d. Francisco Roig [ESP] | 6-3 6-3 | | | | | | | | | |
18‑Jun‑1990 | Genova | Clay | R32 | 52 | 109 | (5)Mattar d. Olivier Delaitre [FRA] | 7-6 6-3 | | | | | | | | | |
11‑Jun‑1990 | Florence | Clay | R32 | 51 | 124 | 6-3 6-2 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R64 | 50 | 38 | Karel Novacek [CZE] d. Mattar | 5-7 6-3 6-2 6-1 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R128 | 50 | 149 | Mattar d. Richard Matuszewski [USA] | 6-4 6-1 6-4 | | | | | | | | | |
21‑May‑1990 | Bologna | Clay | R32 | 48 | 64 | Richard Fromberg [AUS] d. (8)Mattar | 6-1 6-3 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R32 | 51 | 5 | (1)Brad Gilbert [USA] d. Mattar | 7-6 6-4 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R64 | 51 | 36 | Mattar d. David Wheaton [USA] | 6-2 6-3 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R16 | 59 | 50 | (LL)Franco Davin [ARG] d. Mattar | 6-0 6-2 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R32 | 59 | 7 | Mattar d. (6)Andres Gomez [ECU] | 6-7 7-6 6-3 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R64 | 59 | 120 | Mattar d. (Q)Claudio Pistolesi [ITA] | 6-4 7-5 | | | | | | | | | |
30‑Apr‑1990 | Madrid | Clay | R32 | 52 | 23 | (5)Alberto Mancini [ARG] d. Mattar | 6-4 2-6 6-3 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R64 | 51 | 71 | Karel Novacek [CZE] d. Mattar | 6-4 6-1 | | | | | | | | | |
9‑Apr‑1990 | Brasilia1 CH | Carpet | R32 | 36 | 213 | Mauro Menezes [BRA] d. (1)Mattar | 6-3 6-4 | | | | | | | | | |
2‑Apr‑1990 | Rio De Janeiro | Carpet | F | | | (1)Mattar d. (2)Andrew Sznajder [CAN] | 6-4 6-4 | | | | | | | | | |
2‑Apr‑1990 | Rio De Janeiro | Carpet | SF | | | (1)Mattar d. (6)Martin Wostenholme [CAN] | 6-3 6-1 | | | | | | | | | |
2‑Apr‑1990 | Rio De Janeiro | Carpet | QF | | | (1)Mattar d. Paul Vojtischek [GER] | 4-6 6-1 6-3 | | | | | | | | | |
2‑Apr‑1990 | Rio De Janeiro | Carpet | R16 | | | (1)Mattar d. Roberto Arguello [ARG] | 6-3 6-3 | | | | | | | | | |
2‑Apr‑1990 | Rio De Janeiro | Carpet | R32 | | | (1)Mattar d. (WC)Jaime Oncins [BRA] | 1-6 7-5 6-1 | | | | | | | | | |
5‑Feb‑1990 | Guaruja | Hard | F | | | (2)Martin Jaite [ARG] d. (4)Mattar | 3-6 6-4 6-3 | | | | | | | | | |
5‑Feb‑1990 | Guaruja | Hard | SF | | | (4)Mattar d. (7)Eduardo Bengoechea [ARG] | 6-4 6-2 | | | | | | | | | |
5‑Feb‑1990 | Guaruja | Hard | QF | | | (4)Mattar d. (LL)Ivan Kley [BRA] | 6-3 6-2 | | | | | | | | | |
5‑Feb‑1990 | Guaruja | Hard | R16 | | | (4)Mattar d. (Q)Harald Rittersbacher [GER] | 4-6 7-6 6-4 | | | | | | | | | |
5‑Feb‑1990 | Guaruja | Hard | R32 | | | (4)Mattar d. Fernando Roese [BRA] | 7-5 6-3 | | | | | | | | | |