23‑Jan‑1978 | Philadelphia WCT | Carpet | R64 | 55 | 21 | Riessen d. John Alexander [AUS] | 7-6 6-7 6-3 | | | | | | | | | |
27‑Aug‑1975 | US Open | Clay | R128 | 18 | 13 | (12)John Alexander [AUS] d. Riessen | 7-6 6-1 | | | | | | | | | |
21‑Apr‑1975 | Houston | Clay | R16 | 12 | 13 | (1)John Alexander [AUS] d. Riessen | 6-3 6-1 | | | | | | | | | |
31‑Mar‑1975 | Tuscon | Hard | R16 | 11 | 21 | (12)John Alexander [AUS] d. (7)Riessen | 7-6 6-2 | | | | | | | | | |
23‑Feb‑1975 | San Antonio WCT | Hard | QF | 12 | 28 | (6)John Alexander [AUS] d. (1)Riessen | 6-3 6-4 | | | | | | | | | |
23‑Jul‑1974 | Washington | Clay | QF | 14 | 19 | (4)Riessen d. (8)John Alexander [AUS] | 7-5 6-7 6-1 | | | | | | | | | |
14‑Jan‑1974 | Lakeway | Hard | SF | 13 | 29 | John Alexander [AUS] d. Riessen | 4-6 7-6 7-5 | | | | | | | | | |
22‑Oct‑1972 | Vancouver WCT | | R32 | | | Riessen d. John Alexander [AUS] | 7-6 6-2 | | | | | | | | | |
8‑Feb‑1972 | Philadelphia WCT | Carpet | R16 | | | (7)Riessen d. John Alexander [AUS] | 4-6 6-3 7-6 | | | | | | | | | |
22‑Aug‑1971 | Fort Worth WCT | Hard | QF | | | Riessen d. John Alexander [AUS] | 7-6 1-6 6-3 | | | | | | | | | |
21‑Jun‑1971 | Wimbledon | Grass | R64 | | | Riessen d. John Alexander [AUS] | 9-8 6-2 6-3 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R64 | | | (7)Riessen d. John Alexander [AUS] | 0-6 6-4 5-7 6-4 6-3 | | | | | | | | | |
15‑May‑1971 | Tehran WCT | Clay | F | | | Riessen d. John Alexander [AUS] | 6-7 6-1 6-3 7-6 | | | | | | | | | |
9‑Feb‑1971 | Philadelphia WCT | Carpet | R32 | | | John Alexander [AUS] d. Riessen | 6-4 7-6(9) | | | | | | | | | |
30‑Dec‑1968 | Perth | Grass | SF | | | Riessen d. John Alexander [AUS] | 7-5 6-4 2-6 6-3 | | | | | | | | | |
29‑Apr‑1968 | Reggio Calabria | Clay | QF | | | Riessen d. John Alexander [AUS] | 6-2 6-0 | | | | | | | | | |
22‑Apr‑1968 | Naples | Clay | R16 | | | John Alexander [AUS] d. Riessen | 6-4 10-8 | | | | | | | | | |