12‑Nov‑1990 | Tour Finals | Carpet | RR | 8 | 1 | Stefan Edberg [SWE] d. Sanchez | 6-7 6-3 6-1 | | | | | | | | | |
12‑Nov‑1990 | Tour Finals | Carpet | RR | 8 | 5 | Pete Sampras [USA] d. Sanchez | 6-2 6-4 | | | | | | | | | |
12‑Nov‑1990 | Tour Finals | Carpet | RR | 8 | 4 | Andre Agassi [USA] d. Sanchez | 6-0 6-3 | | | | | | | | | |
5‑Nov‑1990 | Moscow | Carpet | QF | 8 | 32 | (8)Andrei Cherkasov [RUS] d. (2)Sanchez | 6-3 6-3 | | | | | | | | | |
5‑Nov‑1990 | Moscow | Carpet | R16 | 8 | 66 | (2)Sanchez d. Veli Paloheimo [FIN] | 2-6 7-5 6-2 | | | | | | | | | |
5‑Nov‑1990 | Moscow | Carpet | R32 | 8 | 88 | (2)Sanchez d. Francisco Clavet [ESP] | 5-7 6-2 7-6 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | QF | 8 | 16 | (14)Jonas Svensson [SWE] d. (6)Sanchez | 7-5 6-4 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | R16 | 8 | 14 | (6)Sanchez d. (12)Guy Forget [FRA] | 7-5 6-3 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | R32 | 8 | 145 | (6)Sanchez d. (Q)Patrick Mcenroe [USA] | 6-4 7-6 | | | | | | | | | |
22‑Oct‑1990 | Stockholm Masters | Carpet | R32 | 8 | 34 | Alexander Volkov [RUS] d. (6)Sanchez | 7-5 6-3 | | | | | | | | | |
1‑Oct‑1990 | Athens | Clay | R32 | 8 | 129 | Francisco Roig [ESP] d. (2)Sanchez | 6-2 7-6 | | | | | | | | | |
24‑Sep‑1990 | Palermo | Clay | R32 | 8 | 98 | Tarik Benhabiles [FRA] d. (1)Sanchez | 7-6 6-4 | | | | | | | | | |
21‑Sep‑1990 | Davis Cup WG PO: URS vs ESP | Carpet | RR | 8 | 34 | Sanchez d. Andrei Cherkasov [RUS] | 6-3 6-7(7) 6-3 6-4 | | | | | | | | | |
21‑Sep‑1990 | Davis Cup WG PO: URS vs ESP | Carpet | RR | 8 | 14 | Sanchez d. Andrei Chesnokov [RUS] | 7-6(3) 7-5 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R16 | 7 | 20 | John Mcenroe [USA] d. (7)Sanchez | 7-6 3-6 4-6 6-4 6-3 | (ch) | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R32 | 7 | 104 | (7)Sanchez d. Fabrice Santoro [FRA] | 6-3 6-4 5-7 3-6 7-5 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R64 | 7 | 125 | (7)Sanchez d. Jim Pugh [USA] | 6-1 6-2 6-2 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R128 | 7 | 117 | (7)Sanchez d. (WC)Brian Garrow [USA] | 7-6 6-4 6-4 | | | | | | | | | |
30‑Jul‑1990 | Kitzbuhel | Clay | SF | 7 | 191 | Horacio De La Pena [ARG] d. (3)Sanchez | 7-5 7-6 | | | | | | | | | |
30‑Jul‑1990 | Kitzbuhel | Clay | QF | 7 | 54 | (3)Sanchez d. (11)Andrei Cherkasov [RUS] | 6-1 6-4 | | | | | | | | | |
30‑Jul‑1990 | Kitzbuhel | Clay | R16 | 7 | 94 | (3)Sanchez d. (13)Udo Riglewski [GER] | 6-3 7-6 | | | | | | | | | |
30‑Jul‑1990 | Kitzbuhel | Clay | R32 | 7 | 162 | (3)Sanchez d. Francisco Roig [ESP] | 6-2 0-6 7-5 | | | | | | | | | |
23‑Jul‑1990 | Hilversum | Clay | SF | 7 | 296 | (Q)Eduardo Masso [BEL] d. (1)Sanchez | 6-4 7-5 | | | | | | | | | |
23‑Jul‑1990 | Hilversum | Clay | QF | 7 | 114 | (1)Sanchez d. (Q)Olivier Delaitre [FRA] | 6-2 7-6 | | | | | | | | | |
23‑Jul‑1990 | Hilversum | Clay | R16 | 7 | 34 | (1)Sanchez d. Wally Masur [AUS] | 4-6 7-6 6-4 | | | | | | | | | |
23‑Jul‑1990 | Hilversum | Clay | R32 | 7 | 145 | (1)Sanchez d. (WC)Tom Nijssen [NED] | 6-3 5-7 6-4 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | SF | 9 | 24 | (10)Goran Ivanisevic [CRO] d. (3)Sanchez | 6-4 6-4 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | QF | 9 | 46 | (3)Sanchez d. Marcelo Filippini [URU] | 7-6 6-2 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | R16 | 9 | 27 | (3)Sanchez d. Richard Fromberg [AUS] | 6-3 2-6 6-2 | | | | | | | | | |
16‑Jul‑1990 | Stuttgart Outdoor | Clay | R32 | 9 | 78 | (3)Sanchez d. Jens Woehrmann [GER] | 4-6 6-3 6-3 | | | | | | | | | |
9‑Jul‑1990 | Gstaad | Clay | QF | 9 | 28 | (8)Marc Rosset [SUI] d. (2)Sanchez | 6-4 3-6 6-3 | | | | | | | | | |
9‑Jul‑1990 | Gstaad | Clay | R16 | 9 | 47 | (2)Sanchez d. Jordi Arrese [ESP] | 6-3 6-2 | | | | | | | | | |
9‑Jul‑1990 | Gstaad | Clay | R32 | 9 | 57 | (2)Sanchez d. Jimmy Arias [USA] | 6-3 6-4 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R128 | 8 | 175 | (Q)Nicklas Kulti [SWE] d. (6)Sanchez | 4-6 6-4 6-7 6-2 6-1 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | SF | 8 | 15 | (8)Andrei Chesnokov [RUS] d. (4)Sanchez | 6-7 6-4 7-6 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | QF | 8 | 22 | (4)Sanchez d. (12)Guillermo Perez Roldan [ARG] | 7-6 6-2 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R16 | 8 | 25 | (4)Sanchez d. (13)Jonas Svensson [SWE] | 6-3 6-2 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R32 | 8 | 60 | (4)Sanchez d. Marcelo Filippini [URU] | 4-6 6-1 6-2 | | | | | | | | | |
14‑May‑1990 | Rome Masters | Clay | R64 | 8 | 64 | (4)Sanchez d. Andrew Sznajder [CAN] | 6-2 6-1 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R16 | 8 | 49 | Guy Forget [FRA] d. (4)Sanchez | 7-6 6-4 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R32 | 8 | 98 | (4)Sanchez d. (Q)Fabrice Santoro [FRA] | 4-6 6-1 6-1 | | | | | | | | | |
30‑Apr‑1990 | Madrid | Clay | R16 | 7 | 47 | Marc Rosset [SUI] d. (3)Sanchez | 4-6 6-4 6-4 | | | | | | | | | |
30‑Apr‑1990 | Madrid | Clay | R32 | 7 | 485 | (3)Sanchez d. (Q)David De Miguel [ESP] | 6-2 6-2 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | SF | 11 | 20 | (12)Andrei Chesnokov [RUS] d. (7)Sanchez | 4-6 6-1 7-6 | (ch) | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | QF | 11 | 3 | (7)Sanchez d. (2)Boris Becker [GER] | 4-6 7-5 7-6 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R16 | 11 | 50 | (7)Sanchez d. (WC)Guy Forget [FRA] | 6-2 6-2 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R32 | 11 | 100 | (7)Sanchez d. (Q)Marian Vajda [SVK] | 6-1 6-1 | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | SF | 10 | 25 | (10)Guillermo Perez Roldan [ARG] d. (3)Sanchez | 7-5 7-6 | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | QF | 10 | 27 | (3)Sanchez d. (11)Sergi Bruguera [ESP] | 5-7 6-4 6-4 | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | R16 | 10 | 75 | (3)Sanchez d. Veli Paloheimo [FIN] | W/O | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | R32 | 10 | 58 | (3)Sanchez d. Franco Davin [ARG] | 6-3 6-1 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | F | 13 | 85 | (3)Sanchez d. Franco Davin [ARG] | 6-3 6-1 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | SF | 13 | 42 | (3)Sanchez d. Jordi Arrese [ESP] | 6-2 6-1 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | QF | 13 | 86 | (3)Sanchez d. Omar Camporese [ITA] | 6-3 6-3 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | R16 | 13 | 58 | (3)Sanchez d. Tomas Carbonell [ESP] | 6-4 6-3 | | | | | | | | | |
2‑Apr‑1990 | Estoril | Clay | R32 | 13 | 84 | (3)Sanchez d. Richard Fromberg [AUS] | 6-4 7-5 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | SF | 18 | 3 | (3)Stefan Edberg [SWE] d. (15)Sanchez | 6-1 7-5 | (ch) | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | QF | 18 | 13 | (15)Sanchez d. (10)Martin Jaite [ARG] | 6-3 6-3 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R16 | 18 | 1 | (15)Sanchez d. (1)Ivan Lendl [USA] | 6-3 6-7 6-4 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R32 | 18 | 21 | (15)Sanchez d. (18)Horst Skoff [AUT] | 3-6 6-3 6-3 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R64 | 18 | 72 | (15)Sanchez d. Lawson Duncan [USA] | 6-4 6-1 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | QF | 19 | 8 | (6)Andre Agassi [USA] d. (14)Sanchez | 6-1 7-6 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R16 | 19 | 4 | (14)Sanchez d. (3)Brad Gilbert [USA] | 6-3 6-3 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R32 | 19 | 445 | (14)Sanchez d. (WC)Shuzo Matsuoka [JPN] | 6-0 6-3 | | | | | | | | | |
5‑Mar‑1990 | Indian Wells Masters | Hard | R64 | 19 | 51 | (14)Sanchez d. Paul Annacone [USA] | 6-3 3-6 6-2 | | | | | | | | | |
19‑Feb‑1990 | Stuttgart Indoor | Carpet | R16 | 17 | 27 | Magnus Gustafsson [SWE] d. (5)Sanchez | 6-3 6-0 | | | | | | | | | |
19‑Feb‑1990 | Stuttgart Indoor | Carpet | R32 | 17 | 52 | 6-4 6-1 | | | | | | | | | |
12‑Feb‑1990 | Brussels | Carpet | R32 | 17 | 39 | Miloslav Mecir [SVK] d. (3)Sanchez | 6-4 3-6 6-4 | | | | | | | | | |
2‑Feb‑1990 | Davis Cup WG R1: ESP vs AUT | Clay | RR | 17 | 29 | Thomas Muster [AUT] d. Sanchez | 1-6 6-2 4-6 6-3 6-4 | | | | | | | | | |
2‑Feb‑1990 | Davis Cup WG R1: ESP vs AUT | Clay | RR | 17 | 20 | Sanchez d. Horst Skoff [AUT] | 6-3 6-3 | | | | | | | | | |
15‑Jan‑1990 | Australian Open | Hard | R128 | 17 | 57 | Jean Philippe Fleurian [FRA] d. (7)Sanchez | 6-2 6-4 6-4 | | | | | | | | | |
1‑Jan‑1990 | Wellington | Hard | F | 17 | 58 | (1)Sanchez d. (8)Richey Reneberg [USA] | 6-7 6-4 4-6 6-4 6-1 | | | | | | | | | |
1‑Jan‑1990 | Wellington | Hard | SF | 17 | 42 | (1)Sanchez d. (5)Paolo Cane [ITA] | 7-5 6-2 | | | | | | | | | |
1‑Jan‑1990 | Wellington | Hard | QF | 17 | 108 | (1)Sanchez d. Richard Fromberg [AUS] | 6-4 6-3 | | | | | | | | | |
1‑Jan‑1990 | Wellington | Hard | R16 | 17 | 131 | (1)Sanchez d. Lars Jonsson [SWE] | 4-6 6-3 7-5 | | | | | | | | | |
1‑Jan‑1990 | Wellington | Hard | R32 | 17 | 201 | (1)Sanchez d. (WC)Steve Guy [NZL] | 4-6 6-1 6-4 | | | | | | | | | |