5‑Nov‑1990 | Moscow | Carpet | R32 | 44 | 111 | (WC)Anders Jarryd [SWE] d. Stich | 6-2 6-0 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | QF | 67 | 2 | (2)Boris Becker [GER] d. (Q)Stich | 6-1 6-2 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | R16 | 67 | 9 | (Q)Stich d. (8)Brad Gilbert [USA] | 6-4 6-4 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | R32 | 67 | 12 | (Q)Stich d. (10)Andrei Chesnokov [RUS] | 7-6 6-4 | | | | | | | | | |
29‑Oct‑1990 | Paris Masters | Carpet | R64 | 67 | 26 | (Q)Stich d. Horst Skoff [AUT] | 6-1 1-0 RET | | | | | | | | | |
15‑Oct‑1990 | Vienna | Carpet | R32 | 66 | 175 | Anders Jarryd [SWE] d. (8)Stich | 7-5 6-2 | | | | | | | | | |
8‑Oct‑1990 | Berlin | Carpet | R32 | 64 | 34 | (5)Petr Korda [CZE] d. Stich | 1-6 6-4 7-6 | | | | | | | | | |
1‑Oct‑1990 | Toulouse | Hard | R32 | 57 | 12 | (2)Andrei Chesnokov [RUS] d. Stich | 2-6 7-6 6-4 | | | | | | | | | |
24‑Sep‑1990 | Basel | Hard | QF | 65 | 10 | (2)Goran Ivanisevic [CRO] d. Stich | 7-6 7-6 | | | | | | | | | |
24‑Sep‑1990 | Basel | Hard | R16 | 65 | 27 | Stich d. (7)Karel Novacek [CZE] | 6-2 6-3 | | | | | | | | | |
24‑Sep‑1990 | Basel | Hard | R32 | 65 | 121 | Stich d. Jimmy Connors [USA] | 7-6 6-3 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R64 | 65 | 3 | (3)Ivan Lendl [USA] d. Stich | 6-4 5-7 6-3 6-3 | | | | | | | | | |
27‑Aug‑1990 | US Open | Hard | R128 | 65 | 108 | Stich d. Lars Jonsson [SWE] | 6-4 6-2 7-5 | | | | | | | | | |
20‑Aug‑1990 | Long Island | Hard | R16 | 67 | 21 | (6)John Mcenroe [USA] d. Stich | 6-3 7-5 | | | | | | | | | |
20‑Aug‑1990 | Long Island | Hard | R32 | 67 | 40 | Stich d. Sergi Bruguera [ESP] | 3-6 6-1 6-3 | | | | | | | | | |
23‑Jul‑1990 | Canada Masters | Hard | R32 | 67 | 4 | (1)Andre Agassi [USA] d. Stich | 6-3 6-7 6-3 | | | | | | | | | |
23‑Jul‑1990 | Canada Masters | Hard | R64 | 67 | 110 | Stich d. Thomas Hogstedt [SWE] | 6-4 6-2 | | | | | | | | | |
16‑Jul‑1990 | Washington | Hard | QF | 73 | 6 | (2)Brad Gilbert [USA] d. Stich | 6-3 6-4 | | | | | | | | | |
16‑Jul‑1990 | Washington | Hard | R16 | 73 | 53 | Stich d. (10)Jakob Hlasek [SUI] | 7-6 7-6 | | | | | | | | | |
16‑Jul‑1990 | Washington | Hard | R32 | 73 | 48 | Stich d. (8)Alexander Volkov [RUS] | 6-4 7-5 | | | | | | | | | |
16‑Jul‑1990 | Washington | Hard | R64 | 73 | 299 | Stich d. (Q)Grant Stafford [RSA] | 7-6 6-0 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R32 | 80 | 21 | (11)Guy Forget [FRA] d. Stich | 3-6 7-6 6-2 4-6 6-3 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R64 | 80 | 57 | Stich d. Aki Rahunen [FIN] | 6-2 7-5 6-3 | | | | | | | | | |
25‑Jun‑1990 | Wimbledon | Grass | R128 | 80 | 420 | Stich d. (Q)Dirk Dier [GER] | 6-2 6-3 6-2 | | | | | | | | | |
11‑Jun‑1990 | Rosmalen | Grass | R16 | 68 | 41 | (5)Richey Reneberg [USA] d. Stich | 5-7 6-3 6-3 | | | | | | | | | |
11‑Jun‑1990 | Rosmalen | Grass | R32 | 68 | 62 | Stich d. Miloslav Mecir [SVK] | 6-3 6-2 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R64 | 69 | 13 | (10)Martin Jaite [ARG] d. Stich | 6-7 6-4 6-7 6-4 6-3 | | | | | | | | | |
28‑May‑1990 | Roland Garros | Clay | R128 | 69 | 99 | Stich d. Joey Rive [USA] | 6-4 6-1 6-1 | | | | | | | | | |
7‑May‑1990 | Hamburg Masters | Clay | R64 | 67 | 37 | Jakob Hlasek [SUI] d. Stich | 7-6 6-4 | | | | | | | | | |
30‑Apr‑1990 | Munich | Clay | R32 | 63 | 100 | Bruno Oresar [CRO] d. Stich | 7-6 6-7 6-4 | | | | | | | | | |
23‑Apr‑1990 | Monte Carlo Masters | Clay | R64 | 63 | 15 | (9)Jim Courier [USA] d. Stich | 6-3 4-6 6-4 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | R16 | 60 | 67 | Andrei Cherkasov [RUS] d. Stich | 6-4 6-4 | | | | | | | | | |
16‑Apr‑1990 | Nice | Clay | R32 | 60 | 65 | Stich d. Jimmy Arias [USA] | 6-3 3-6 6-3 | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | R32 | 63 | 31 | (15)Jordi Arrese [ESP] d. Stich | 6-3 3-6 7-5 | | | | | | | | | |
9‑Apr‑1990 | Barcelona | Clay | R64 | 63 | 86 | Stich d. Richard Fromberg [AUS] | 4-6 7-6 7-6 | | | | | | | | | |
30‑Mar‑1990 | Davis Cup WG QF: ARG vs GER | Clay | RR | 60 | 11 | Martin Jaite [ARG] d. Stich | 4-6 6-4 6-1 1-6 6-3 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R64 | 62 | 33 | (23)Christo Van Rensburg [RSA] d. Stich | 6-3 6-4 | | | | | | | | | |
16‑Mar‑1990 | Miami Masters | Hard | R128 | 62 | 97 | Stich d. Lars Anders Wahlgren [SWE] | 6-4 6-2 | | | | | | | | | |
26‑Feb‑1990 | Memphis | Hard | F | 80 | 38 | Stich d. (6)Wally Masur [AUS] | 6-7 6-4 7-6 | | | | | | | | | |
26‑Feb‑1990 | Memphis | Hard | SF | 80 | 104 | Stich d. Gary Muller [RSA] | 7-5 7-6 | | | | | | | | | |
26‑Feb‑1990 | Memphis | Hard | QF | 80 | 216 | Stich d. (Q)Malivai Washington [USA] | 6-4 7-6 | | | | | | | | | |
26‑Feb‑1990 | Memphis | Hard | R16 | 80 | 19 | Stich d. (3)Andrei Chesnokov [RUS] | 6-3 6-1 | | | | | | | | | |
26‑Feb‑1990 | Memphis | Hard | R32 | 80 | 50 | Stich d. (14)Kelly Evernden [NZL] | 6-1 6-2 | | | | | | | | | |
26‑Feb‑1990 | Memphis | Hard | R64 | 80 | 102 | Stich d. Grant Connell [CAN] | 4-6 7-6 6-4 | | | | | | | | | |
19‑Feb‑1990 | Stuttgart Indoor | Carpet | R32 | 80 | 44 | Jonas Svensson [SWE] d. (WC)Stich | 7-6 7-5 | | | | | | | | | |
2‑Feb‑1990 | Davis Cup WG R1: GER vs NED | Carpet | RR | 79 | 115 | Tom Nijssen [NED] d. Stich | 7-6(5) 6-1 | | | | | | | | | |
15‑Jan‑1990 | Australian Open | Hard | R32 | 85 | 18 | (9)Andres Gomez [ECU] d. Stich | 6-4 6-3 3-6 7-6 | | | | | | | | | |
15‑Jan‑1990 | Australian Open | Hard | R64 | 85 | 135 | Stich d. Leonardo Lavalle [MEX] | 6-4 6-4 2-0 RET | | | | | | | | | |
15‑Jan‑1990 | Australian Open | Hard | R128 | 85 | 186 | Stich d. (Q)Peter Doohan [AUS] | 6-3 6-2 6-2 | | | | | | | | | |
8‑Jan‑1990 | Auckland | Hard | R16 | 90 | 129 | Grant Connell [CAN] d. Stich | 6-4 6-7 6-2 | | | | | | | | | |
8‑Jan‑1990 | Auckland | Hard | R32 | 90 | 119 | Stich d. (Q)Kelly Jones [USA] | 7-5 6-3 | | | | | | | | | |
1‑Jan‑1990 | Adelaide | Hard | QF | 113 | 25 | (1)Sergi Bruguera [ESP] d. Stich | 6-7 6-0 6-4 | | | | | | | | | |
1‑Jan‑1990 | Adelaide | Hard | R16 | 113 | 68 | Stich d. (7)Michiel Schapers [NED] | 6-4 6-3 | | | | | | | | | |
1‑Jan‑1990 | Adelaide | Hard | R32 | 113 | 71 | Stich d. Nicklas Kroon [SWE] | 6-4 6-3 | | | | | | | | | |