| 10‑Mar‑1980 | Stuttgart Indoor | Hard | F | 73 | 30 | (2)Tomas Smid [CZE] d. (8)Cox | 6-1 6-3 5-7 1-6 6-4 | | | | | | | | | |
| 11‑Jul‑1977 | Cincinnati | Clay | F | 14 | 13 | (3)Harold Solomon [USA] d. (4)Cox | 6-2 6-3 | | | | | | | | | |
| 13‑Jun‑1977 | Queen's Club | Grass | F | 15 | 6 | Raul Ramirez [MEX] d. Cox | 9-7 7-5 | | | | | | | | | |
| 14‑Mar‑1977 | Helsinki | Carpet | F | 15 | | (1)Cox d. Kjell Johansson [SWE] | 6-3 6-3 | | | | | | | | | |
| 7‑Nov‑1976 | Stockholm | Hard | F | | | Cox d. Manuel Orantes [ESP] | 4-6 7-5 7-6 | | | | | | | | | |
| 24‑Mar‑1975 | Atlanta WCT | Carpet | F | 51 | 21 | (5)Cox d. (2)John Alexander [AUS] | 6-3 7-6(3) | | | | | | | | | |
| 10‑Mar‑1975 | Washington Indoor WCT | Carpet | F | 51 | 14 | Cox d. (3)Dick Stockton [USA] | 6-2 7-6(5) | | | | | | | | | |
| 4‑Mar‑1975 | London WCT | Carpet | F | 51 | 93 | Cox d. Brian Fairlie [NZL] | 6-1 7-5 | | | | | | | | | |
| 18‑Feb‑1974 | London WCT | Hard | F | 22 | 18 | (6)Bjorn Borg [SWE] d. (7)Cox | 6-7(4) 7-6(6) 6-4 | | | | | | | | | |
| 11‑Feb‑1974 | Bologna WCT | Carpet | F | 22 | 10 | (3)Arthur Ashe [USA] d. (7)Cox | 6-4 7-5 | | | | | | | | | |
| 9‑Jul‑1973 | Dublin | Hard | F | | | Cox d. John Yuill [RSA] | 7-5 3-6 11-9 | | | | | | | | | |
| 23‑Jun‑1973 | Eastbourne | Grass | F | | | Cox d. Patrice Dominguez [FRA] | 6-2 2-6 6-3 | | | | | | | | | |
| 23‑Apr‑1973 | Denver WCT | Carpet | F | | | Cox d. Arthur Ashe [USA] | 6-1 6-1 | | | | | | | | | |
| 18‑Jan‑1973 | London WCT | Hard | F | | | Brian Fairlie [NZL] d. Cox | 2-6 6-2 6-2 7-6 | | | | | | | | | |
| 13‑Aug‑1972 | Cleveland WCT | Hard | F | | | Cox d. Ray Ruffels [AUS] | 6-3 4-6 4-6 6-3 6-4 | | | | | | | | | |
| 29‑Jul‑1972 | Louisville WCT | Clay | F | | | Arthur Ashe [USA] d. Cox | 6-4 6-4 | | | | | | | | | |
| 28‑Mar‑1972 | Macon | Carpet | F | | | Cox d. Roy Emerson [AUS] | 6-3 6-7 6-3 | | | | | | | | | |
| 24‑Sep‑1971 | Midland | Hard | F | | | Nikola Pilic [CRO] d. Cox | 7-6 7-6 6-3 | | | | | | | | | |
| 26‑Apr‑1970 | Bournemouth | Clay | F | | | (5)Cox d. (3)Bob Hewitt [RSA] | 6-1 6-2 6-3 | | | | | | | | | |
| 13‑Nov‑1969 | London-4 | Carpet | F | | | Cox d. Bob Hewitt [RSA] | 4-6 9-7 6-2 | | | | | | | | | |
| 8‑Nov‑1969 | Torquay | Carpet | F | | | Cox d. John Clifton [GBR] | 8-6 6-3 | | | | | | | | | |
| 25‑Oct‑1969 | Stalybridge | Carpet | F | | | Cox d. Bob Hewitt [RSA] | 6-4 6-3 | | | | | | | | | |
| 18‑Oct‑1969 | Perth Dewar | Carpet | F | | | Cox d. Ismail El Shafei [EGY] | 3-6 14-12 6-1 | | | | | | | | | |
| 7‑Apr‑1969 | Charlotte | Clay | F | | | Cox d. Jan Kodes [CZE] | 13-11 6-2 | | | | | | | | | |
| 3‑Mar‑1969 | Caracas | Clay | F | | | Thomaz Koch [BRA] d. Cox | 8-6 6-3 2-6 6-4 | | | | | | | | | |
| 24‑Feb‑1969 | Curacao | Hard | F | | | Cliff Richey [USA] d. Cox | 6-4 6-3 6-3 | | | | | | | | | |
| 17‑Feb‑1969 | Macon | Carpet | F | | | Manuel Orantes [ESP] d. Cox | 10-8 7-5 4-6 10-8 | | | | | | | | | |
| 8‑Feb‑1969 | Buffalo | Hard | F | | | Clark Graebner [USA] d. Cox | 2-6 9-7 8-6 | | | | | | | | | |
| 21‑Nov‑1968 | London 3 | Hard | F | | | Stan Smith [USA] d. Cox | 6-4 6-4 | | | | | | | | | |
| 1‑Apr‑1968 | San Juan | Hard | F | | | Cox d. Alan Fox [USA] | 6-2 6-1 4-6 2-6 6-2 | | | | | | | | | |
| 10‑Feb‑1968 | Pittsburgh Indoors | Carpet | F | | | Cox d. Bob Lutz [USA] | 6-4 2-6 7-5 | | | | | | | | | |
| 18‑Dec‑1967 | East London | Clay | F | | | Tom Okker [NED] d. Cox | 9-7 7-5 | | | | | | | | | |
| 12‑Apr‑1965 | Chingford | Clay | F | | | Robert Wilson [GBR] d. Cox | 6-2 8-6 | | | | | | | | | |
| 6‑Sep‑1962 | South of England Championships | Grass | F | | | Roger Becker [GBR] d. Cox | 4-6 6-2 6-4 | | | | | | | | | |
| 27‑Aug‑1962 | Budleigh Salterton | Grass | F | | | Jaroslav Drobny [TCH] d. Cox | 6-4 0-6 6-2 | | | | | | | | | |