25‑Nov‑1991 | Johannesburg CH | Hard | R16 | 108 | 50 | (5)Wayne Ferreira [RSA] d. Muller | 6-7 7-6 7-6 | | | | | | | | | |
25‑Nov‑1991 | Johannesburg CH | Hard | R32 | 108 | 158 | Muller d. David Pate [USA] | 6-3 6-4 | | | | | | | | | |
4‑Nov‑1991 | Birmingham | Carpet | R16 | 104 | 33 | (3)Richey Reneberg [USA] d. Muller | 7-6(4) 6-3 | | 0.71 | 8.8% | 7.4% | 35.3% | 75.0% | 47.7% | 4/7 | 1:23 |
4‑Nov‑1991 | Birmingham | Carpet | R32 | 104 | 138 | Muller d. (Q)David Engel [SWE] | 6-1 3-6 6-3 | | 1.21 | 11.3% | 8.5% | 60.6% | 86.0% | 32.1% | 0/3 | 1:22 |
14‑Oct‑1991 | Vienna | Carpet | R32 | 96 | 33 | Patrick Mcenroe [USA] d. Muller | 7-5 6-3 | | 0.67 | 11.9% | 7.5% | 52.2% | 71.4% | 46.9% | 2/5 | 1:17 |
7‑Oct‑1991 | Tokyo Indoor | Carpet | R32 | 99 | 63 | (15)Frederic Fontang [FRA] d. Muller | 7-6(3) 6-4 | | 0.85 | 8.5% | 7.0% | 54.9% | 76.9% | 46.9% | 1/3 | 1:25 |
7‑Oct‑1991 | Tokyo Indoor | Carpet | R64 | 99 | 139 | Muller d. Slava Dosedel [CZE] | 7-5 7-6(5) | | 0.85 | 25.0% | 3.4% | 64.8% | 84.2% | 41.9% | 7/7 | 1:34 |
30‑Sep‑1991 | Sydney Indoor | Hard | R64 | 102 | 110 | Peter Lundgren [SWE] d. Muller | 7-6(4) 6-3 | | 0.86 | 14.5% | 3.9% | 59.2% | 71.1% | 35.5% | 7/10 | 1:27 |
23‑Sep‑1991 | Brisbane | Hard | R32 | 97 | 114 | Jason Stoltenberg [AUS] d. (7)Muller | 6-7(8) 6-2 6-2 | | 0.74 | 2.9% | 5.9% | 57.8% | 69.5% | 34.9% | 3/9 | 2:01 |
26‑Aug‑1991 | US Open | Hard | R128 | 81 | 160 | (WC)Todd Martin [USA] d. Muller | 6-3 7-6(6) 6-2 | | 0.66 | 4.6% | 4.6% | 64.4% | 64.3% | 45.2% | 2/6 | 2:02 |
12‑Aug‑1991 | Indianapolis | Hard | R64 | 82 | 24 | (10)Alexander Volkov [RUS] d. Muller | 3-6 6-2 6-3 | | 0.96 | 8.0% | 2.7% | 49.3% | 70.3% | 60.5% | 2/5 | 1:40 |
5‑Aug‑1991 | Cincinnati Masters | Hard | R64 | 85 | 57 | Wally Masur [AUS] d. Muller | 6-7(3) 6-4 7-6(4) | | 1.12 | 18.9% | 4.2% | 66.3% | 87.3% | 59.4% | 0/1 | 2:06 |
29‑Jul‑1991 | Los Angeles | Hard | R16 | 76 | 66 | Scott Davis [USA] d. Muller | 7-6(5) 3-6 6-3 | | 0.88 | 20.4% | 3.9% | 58.3% | 71.7% | 60.5% | 7/9 | 2:07 |
29‑Jul‑1991 | Los Angeles | Hard | R32 | 76 | 442 | Muller d. (WC)Jonathan Stark [USA] | 7-5 7-5 | | 1.12 | 14.7% | 5.3% | 54.7% | 87.8% | 50.0% | 3/4 | 1:31 |
24‑Jun‑1991 | Wimbledon | Grass | R64 | 65 | 82 | Christian Saceanu [GER] d. Muller | 7-6(6) 6-4 3-6 7-6(5) | | 0.83 | 5.8% | 7.1% | 66.5% | 68.0% | 59.6% | 8/10 | 2:45 |
24‑Jun‑1991 | Wimbledon | Grass | R128 | 65 | 35 | Muller d. Jordi Arrese [ESP] | 6-2 6-3 6-3 | | 3.00 | 11.5% | 3.3% | 59.0% | 91.7% | 76.0% | 0/0 | 1:14 |
17‑Jun‑1991 | Manchester | Grass | SF | 77 | 11 | (2)Goran Ivanisevic [CRO] d. Muller | 7-6(9) 7-6(4) | | 1.12 | 19.2% | 6.4% | 61.5% | 85.4% | 63.3% | 0/0 | 1:29 |
17‑Jun‑1991 | Manchester | Grass | QF | 77 | 63 | Muller d. Todd Witsken [USA] | 3-6 7-6(3) 6-2 | | 1.12 | 3.3% | 6.6% | 50.5% | 82.6% | 44.4% | 4/8 | 1:45 |
17‑Jun‑1991 | Manchester | Grass | R16 | 77 | 25 | Muller d. (6)Alexander Volkov [RUS] | 7-6(3) 7-6(4) | | 1.27 | 25.0% | 4.5% | 62.5% | 80.0% | 57.6% | 2/3 | 1:43 |
17‑Jun‑1991 | Manchester | Grass | R32 | 77 | 185 | Muller d. (Q)Chris Pridham [CAN] | 6-2 7-5 | | 1.46 | 26.7% | 11.7% | 66.7% | 85.0% | 40.0% | 5/6 | 1:06 |
10‑Jun‑1991 | Queen's Club | Grass | R64 | 74 | 92 | Shuzo Matsuoka [JPN] d. Muller | 7-6(4) 7-6(9) | | 1.14 | 10.1% | 5.1% | 59.5% | 78.7% | 75.0% | 2/2 | 1:46 |
27‑May‑1991 | Roland Garros | Clay | R64 | 76 | 243 | (Q)Todd Martin [USA] d. Muller | 6-1 6-2 6-2 | | 0.43 | 5.3% | 5.3% | 48.0% | 66.7% | 30.8% | 7/13 | 1:31 |
27‑May‑1991 | Roland Garros | Clay | R128 | 76 | 85 | Muller d. Grant Connell [CAN] | 6-4 4-6 6-3 6-7(2) 6-0 | | | | | | | | | |
22‑Apr‑1991 | Singapore | Hard | R32 | 70 | 99 | Shuzo Matsuoka [JPN] d. (8)Muller | 6-3 6-3 | | 0.52 | 12.2% | 4.1% | 63.3% | 67.7% | 44.4% | 0/3 | 0:58 |
15‑Apr‑1991 | Taipei CH | Hard | R16 | 72 | 145 | Mark Kratzmann [AUS] d. (3)Muller | 6-3 6-4 | | | | | | | | | |
15‑Apr‑1991 | Taipei CH | Hard | R32 | 72 | 175 | (3)Muller d. Jonathan Canter [USA] | 6-4 6-4 | | | | | | | | | |
8‑Apr‑1991 | Tokyo Outdoor | Hard | R64 | 58 | 94 | Tim Mayotte [USA] d. Muller | 7-6(4) 4-6 6-3 | | 0.91 | 4.4% | 3.5% | 73.7% | 71.4% | 53.3% | 7/8 | 2:06 |
1‑Apr‑1991 | Hong Kong | Hard | SF | 72 | 93 | Richard Krajicek [NED] d. Muller | 6-2 6-4 | | 0.46 | 3.0% | 1.5% | 58.2% | 64.1% | 46.4% | 3/6 | 1:00 |
1‑Apr‑1991 | Hong Kong | Hard | QF | 72 | 12 | Muller d. (1)Michael Chang [USA] | 5-7 6-3 7-6(1) | | 0.94 | 13.4% | 3.4% | 62.2% | 68.9% | 46.7% | 12/16 | 2:34 |
1‑Apr‑1991 | Hong Kong | Hard | R16 | 72 | 181 | Muller d. (WC)Tommy Ho [USA] | 6-1 1-6 6-3 | | 0.99 | 12.2% | 0.0% | 59.5% | 63.6% | 53.3% | 5/8 | 1:35 |
1‑Apr‑1991 | Hong Kong | Hard | R32 | 72 | 63 | Muller d. Jaime Yzaga [PER] | 6-3 6-4 | | 1.25 | 5.5% | 1.8% | 67.3% | 78.4% | 61.1% | 0/0 | 1:03 |
15‑Mar‑1991 | Miami Masters | Hard | R64 | 75 | 43 | (31)Goran Prpic [CRO] d. Muller | 6-4 6-0 | | 0.53 | 15.0% | 0.0% | 63.3% | 57.9% | 27.3% | 7/11 | 1:01 |
15‑Mar‑1991 | Miami Masters | Hard | R128 | 75 | 54 | Muller d. Scott Davis [USA] | 7-6(9) 6-4 | | 1.38 | 16.2% | 1.5% | 67.6% | 82.6% | 40.9% | 3/5 | 1:24 |
4‑Mar‑1991 | Indian Wells Masters | Hard | R64 | 76 | 80 | Tomas Carbonell [ESP] d. Muller | 6-4 6-1 | | 0.64 | 10.0% | 2.5% | 55.0% | 56.8% | 41.7% | 13/18 | 1:15 |
25‑Feb‑1991 | Chicago | Carpet | R16 | 54 | 86 | Alexander Mronz [GER] d. (8)Muller | 7-6(6) 6-3 | | 0.76 | 13.3% | 5.3% | 56.0% | 81.0% | 36.4% | 1/3 | 1:28 |
25‑Feb‑1991 | Chicago | Carpet | R32 | 54 | 57 | (8)Muller d. Jean Philippe Fleurian [FRA] | 6-4 6-4 | | 1.73 | 23.5% | 2.0% | 58.8% | 90.0% | 57.1% | 1/2 | 1:06 |
18‑Feb‑1991 | Memphis | Hard | R32 | 57 | 52 | (16)Paul Haarhuis [NED] d. Muller | 6-3 6-1 | | 0.34 | 4.3% | 0.0% | 63.8% | 56.7% | 47.1% | 1/5 | 0:45 |
18‑Feb‑1991 | Memphis | Hard | R64 | 57 | 72 | Muller d. Jimmy Arias [USA] | 6-7(2) 7-6(7) 6-4 | | 0.95 | 1.6% | 3.2% | 66.9% | 72.3% | 41.5% | 2/6 | 2:28 |
11‑Feb‑1991 | Philadelphia | Carpet | R16 | 68 | 3 | (1)Ivan Lendl [USA] d. Muller | 7-6(5) 6-3 | | 0.53 | 10.1% | 5.1% | 53.2% | 69.0% | 45.9% | 4/6 | 1:27 |
11‑Feb‑1991 | Philadelphia | Carpet | R32 | 68 | 79 | Muller d. Renzo Furlan [ITA] | 6-7(5) 6-3 6-4 | | 1.21 | 8.3% | 3.1% | 60.4% | 84.5% | 44.7% | 2/4 | 1:57 |
4‑Feb‑1991 | San Francisco | Carpet | R32 | 54 | 107 | Luis Herrera [MEX] d. (8)Muller | 6-4 7-6(4) | | 0.76 | 11.6% | 8.1% | 59.3% | 74.5% | 42.9% | 6/8 | 1:20 |
14‑Jan‑1991 | Australian Open | Hard | R128 | 54 | 71 | Anders Jarryd [SWE] d. Muller | 6-4 6-3 6-1 | | 0.45 | 4.5% | 3.0% | 59.7% | 75.0% | 37.0% | 2/7 | 1:20 |