5‑Nov‑1990 | Itaparica | Hard | R32 | 18 | 165 | (WC)Danilo Marcelino [BRA] d. (1)Aguilera | 7-6 6-3 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | R32 | 19 | 23 | Jim Courier [USA] d. (16)Aguilera | 6-1 6-2 | | | | | | | | | |
24‑Sep‑1990 | Palermo | Clay | F | 20 | 47 | (7)Franco Davin [ARG] d. (3)Aguilera | 6-1 6-1 | | | | | | | | | |
24‑Sep‑1990 | Palermo | Clay | SF | 20 | 14 | (3)Aguilera d. (2)Guillermo Perez Roldan [ARG] | 6-2 6-3 | | | | | | | | | |
24‑Sep‑1990 | Palermo | Clay | QF | 20 | 123 | (3)Aguilera d. Claudio Pistolesi [ITA] | 6-4 6-4 | | | | | | | | | |
24‑Sep‑1990 | Palermo | Clay | R16 | 20 | 61 | (3)Aguilera d. Javier Sanchez [ESP] | 7-6 6-4 | | | | | | | | | |
24‑Sep‑1990 | Palermo | Clay | R32 | 20 | 127 | (3)Aguilera d. Stefano Pescosolido [ITA] | 6-3 4-6 3-1 RET | | | | | | | | | |
10‑Sep‑1990 | Bordeaux | Clay | R32 | 20 | 86 | Thierry Champion [FRA] d. (5)Aguilera | 6-2 5-7 7-6 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R128 | 19 | 2 | (2)Boris Becker [GER] d. Aguilera | 7-5 6-3 6-2 | | | | | | | | | |
30‑Jul‑1990 | San Remo | Clay | F | 19 | 62 | (7)Jordi Arrese [ESP] d. (2)Aguilera | 6-2 6-2 | | | | | | | | | |
30‑Jul‑1990 | San Remo | Clay | SF | 19 | 99 | (2)Aguilera d. Roberto Azar [ARG] | 7-6 6-2 | | | | | | | | | |
30‑Jul‑1990 | San Remo | Clay | QF | 19 | 47 | (2)Aguilera d. (8)Omar Camporese [ITA] | 6-3 6-2 | | | | | | | | | |
30‑Jul‑1990 | San Remo | Clay | R16 | 19 | 226 | (2)Aguilera d. Francisco Yunis [ARG] | 3-6 6-4 6-0 | | | | | | | | | |
30‑Jul‑1990 | San Remo | Clay | R32 | 19 | 593 | (2)Aguilera d. (Q)Mihnea Ion Nastase [ROU] | 6-0 6-3 | | | | | | | | | |
23‑Jul‑1990 | Hilversum | Clay | R16 | 17 | 296 | (Q)Eduardo Masso [BEL] d. (3)Aguilera | 6-3 3-6 6-2 | | | | | | | | | |
23‑Jul‑1990 | Hilversum | Clay | R32 | 17 | 107 | (3)Aguilera d. Marian Vajda [SVK] | 6-4 7-5 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | R32 | 15 | 35 | Wally Masur [AUS] d. (7)Aguilera | 7-6 7-5 | | | | | | | | | |
9‑Jul‑1990 | Gstaad | Clay | R16 | 15 | 44 | Sergi Bruguera [ESP] d. (6)Aguilera | 6-3 6-4 | | | | | | | | | |
9‑Jul‑1990 | Gstaad | Clay | R32 | 15 | 289 | (6)Aguilera d. (Q)Cyril Suk [CZE] | 7-6 2-6 7-5 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R32 | 16 | 142 | (WC)Pat Cash [AUS] d. Aguilera | 6-1 6-1 6-4 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R64 | 16 | 176 | Aguilera d. (Q)Wayne Ferreira [RSA] | 6-3 7-6 7-5 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R128 | 16 | 105 | Aguilera d. Martin Strelba [CZE] | 6-3 7-5 6-3 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R64 | 16 | 191 | (Q)Thierry Champion [FRA] d. (12)Aguilera | 3-6 6-3 6-3 6-2 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R128 | 16 | 82 | (12)Aguilera d. Malivai Washington [USA] | 7-5 4-6 6-1 6-2 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R64 | 14 | 103 | Alexander Volkov [RUS] d. Aguilera | 6-3 1-6 6-4 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | F | 26 | 3 | Aguilera d. (1)Boris Becker [GER] | 6-1 6-0 7-6 | (ch) | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | SF | 26 | 49 | Aguilera d. Guy Forget [FRA] | 7-5 7-6 | (ch) | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | QF | 26 | 23 | Aguilera d. (15)Magnus Gustafsson [SWE] | 6-1 6-4 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R16 | 26 | 15 | Aguilera d. (10)Jim Courier [USA] | 1-6 6-4 6-4 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R32 | 26 | 12 | Aguilera d. (7)Michael Chang [USA] | 6-3 6-2 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R64 | 26 | 43 | Aguilera d. Goran Ivanisevic [CRO] | 6-4 6-1 | | | | | | | | | |
30‑Apr‑1990 | Madrid | Clay | R32 | 26 | 75 | Mark Koevermans [NED] d. (8)Aguilera | 0-6 6-2 6-3 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | QF | 32 | 30 | Thomas Muster [AUT] d. Aguilera | 6-3 6-4 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R16 | 32 | 2 | Aguilera d. (1)Stefan Edberg [SWE] | 7-6 7-6 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R32 | 32 | 24 | Aguilera d. (16)Sergi Bruguera [ESP] | 6-7 6-4 RET | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R64 | 32 | 146 | Aguilera d. (WC)Diego Nargiso [ITA] | 6-1 6-3 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | F | 51 | 71 | Aguilera d. (WC)Guy Forget [FRA] | 2-6 6-3 6-4 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | SF | 51 | 79 | Aguilera d. Marc Rosset [SUI] | 6-3 6-0 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | QF | 51 | 42 | Aguilera d. Jakob Hlasek [SUI] | 6-4 6-4 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | R16 | 51 | 78 | Aguilera d. Aki Rahunen [FIN] | 6-2 2-6 6-4 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | R32 | 51 | 33 | Aguilera d. Javier Sanchez [ESP] | 6-4 2-6 6-1 | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | R64 | 57 | 75 | Veli Paloheimo [FIN] d. Aguilera | 7-6 4-6 6-3 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | SF | 70 | 85 | Franco Davin [ARG] d. Aguilera | 6-4 6-3 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | QF | 70 | 22 | Aguilera d. (5)Thomas Muster [AUT] | 6-3 6-0 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | R16 | 70 | 33 | Aguilera d. Paolo Cane [ITA] | 6-2 6-7 6-4 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | R32 | 70 | 15 | Aguilera d. (4)Andres Gomez [ECU] | 4-6 7-6 6-1 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R128 | 68 | 77 | Ramesh Krishnan [IND] d. Aguilera | 6-7 6-2 6-2 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R64 | 67 | 41 | (WC)Scott Davis [USA] d. Aguilera | 6-2 6-4 | | | | | | | | | |
12‑Feb‑1990 | Brussels | Carpet | R16 | 74 | 33 | (7)Paolo Cane [ITA] d. Aguilera | 6-3 6-7 6-4 | | | | | | | | | |
12‑Feb‑1990 | Brussels | Carpet | R32 | 74 | 61 | Aguilera d. Martin Strelba [CZE] | 6-2 6-7 6-3 | | | | | | | | | |