21‑Nov‑1968 | London 3 | Hard | F | | | Stan Smith [USA] d. Cox | 6-4 6-4 | | | | | | | | | |
21‑Nov‑1968 | London 3 | Hard | SF | | | Cox d. Bob Lutz [USA] | 6-4 6-4 | | | | | | | | | |
21‑Nov‑1968 | London 3 | Hard | QF | | | Cox d. Keith Wooldridge [GBR] | 6-0 6-1 | | | | | | | | | |
11‑Nov‑1968 | London 2 | Hard | QF | | | (4)Bob Hewitt [RSA] d. (5)Cox | 6-3 8-10 7-5 4-6 6-3 | | | | | | | | | |
11‑Nov‑1968 | London 2 | Hard | R16 | | | (5)Cox d. Jan Kukal [CZE] | 6-1 10-8 6-8 6-3 | | | | | | | | | |
11‑Nov‑1968 | London 2 | Hard | R32 | | | (5)Cox d. David Lloyd [GBR] | 6-1 6-1 7-5 | | | | | | | | | |
28‑Oct‑1968 | Aberavon | Carpet | SF | | | Bob Hewitt [RSA] d. Cox | 3-6 6-3 7-5 | | | | | | | | | |
28‑Oct‑1968 | Aberavon | Carpet | QF | | | Cox d. Jan Kukal [CZE] | 7-5 14-12 | | | | | | | | | |
28‑Oct‑1968 | Aberavon | Carpet | R16 | | | Cox d. John Paish [GBR] | 6-0 6-2 | | | | | | | | | |
13‑Aug‑1968 | Hamburg | Clay | R16 | | | Cliff Drysdale [RSA] d. Cox | 6-4 6-4 1-6 4-6 6-1 | | | | | | | | | |
13‑Aug‑1968 | Hamburg | Clay | R32 | | | Cox d. Jurgen Fassbender [GER] | 6-1 6-4 6-2 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | SF | | | Ion Tiriac [ROU] d. Cox | 6-3 6-4 6-3 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | QF | | | Cox d. Tom Okker [NED] | 8-10 4-6 6-1 6-4 6-4 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | R16 | | | Cox d. John Alexander [AUS] | 6-4 6-2 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | R32 | | | Cox d. Terry Ryan [RSA] | 9-7 6-3 | | | | | | | | | |
31‑Jul‑1968 | Munich | Clay | R64 | | | Cox d. Norman Perry [USA] | 8-6 6-2 | | | | | | | | | |
8‑Jul‑1968 | Dublin | Grass | SF | | | Lew Hoad [AUS] d. Cox | 6-3 1-6 6-4 | | | | | | | | | |
8‑Jul‑1968 | Dublin | Grass | QF | | | Cox d. Tom Edlefsen [USA] | 6-4 6-2 | | | | | | | | | |
8‑Jul‑1968 | Dublin | Grass | R16 | | | Cox d. John Bartlett [AUS] | 6-3 6-2 | | | | | | | | | |
8‑Jul‑1968 | Dublin | Grass | R32 | | | Cox d. Unknown Doherty [] | 6-0 6-3 | | | | | | | | | |
24‑Jun‑1968 | Wimbledon | Grass | R16 | | | (1)Rod Laver [AUS] d. Cox | 9-7 5-7 6-2 6-0 | | | | | | | | | |
24‑Jun‑1968 | Wimbledon | Grass | R32 | | | Cox d. Daniel Contet [FRA] | 6-3 6-4 6-4 | | | | | | | | | |
24‑Jun‑1968 | Wimbledon | Grass | R64 | | | Cox d. Herb Fitzgibbon [USA] | 4-6 6-3 7-9 9-7 12-10 | | | | | | | | | |
24‑Jun‑1968 | Wimbledon | Grass | R128 | | | Cox d. Gordon Forbes [RSA] | 7-9 8-6 6-3 6-4 | | | | | | | | | |
14‑Jun‑1968 | Davis Cup EUR SF: ESP vs GBR | Clay | RR | | | Manuel Santana [ESP] d. Cox | 6-1 6-3 6-3 | | | | | | | | | |
14‑Jun‑1968 | Davis Cup EUR SF: ESP vs GBR | Clay | RR | | | Cox d. Juan Gisbert [ESP] | 4-6 6-3 6-3 6-3 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R32 | | | (12)Istvan Gulyas [HUN] d. Cox | 3-6 8-6 6-2 6-2 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R64 | | | Cox d. Eduardo Zuleta [ECU] | 6-0 6-1 6-8 6-3 | | | | | | | | | |
27‑May‑1968 | Roland Garros | Clay | R128 | | | Cox d. Bernard Paul [FRA] | 6-1 6-1 6-1 | | | | | | | | | |
6‑May‑1968 | Rome | Clay | R32 | | | Milan Holecek [CZE] d. (8)Cox | 1-6 8-6 4-6 6-1 7-5 | | | | | | | | | |
6‑May‑1968 | Rome | Clay | R64 | | | (8)Cox d. Francesco Giordano [ITA] | W/O | | | | | | | | | |
2‑May‑1968 | Davis Cup EUR R1: GBR vs FRA | Clay | RR | | | Cox d. Georges Goven [FRA] | 3-6 4-6 6-1 7-5 7-5 | | | | | | | | | |
22‑Apr‑1968 | Bournemouth | Clay | SF | | | (1)Rod Laver [AUS] d. Cox | 6-4 6-1 6-0 | | | | | | | | | |
22‑Apr‑1968 | Bournemouth | Clay | QF | | | Cox d. (5)Roy Emerson [AUS] | 6-0 6-1 7-5 | | | | | | | | | |
22‑Apr‑1968 | Bournemouth | Clay | R16 | | | Cox d. Richard Gonzalez [USA] | 0-6 6-2 4-6 6-3 6-3 | | | | | | | | | |
22‑Apr‑1968 | Bournemouth | Clay | R32 | | | Cox d. Mel Baleson [RSA] | 6-2 6-1 8-6 | | | | | | | | | |
15‑Apr‑1968 | Charlotte | Clay | SF | | | Ron Holmberg [USA] d. Cox | 6-4 6-8 7-5 | | | | | | | | | |
15‑Apr‑1968 | Charlotte | Clay | QF | | | Cox d. Bill Bowrey [AUS] | 6-4 6-3 | | | | | | | | | |
15‑Apr‑1968 | Charlotte | Clay | R16 | | | Cox d. Keith Stoneman [UNK] | 6-3 7-5 | | | | | | | | | |
8‑Apr‑1968 | Tampa | Clay | SF | | | Istvan Gulyas [HUN] d. Cox | 2-6 0-6 6-0 9-7 6-2 | | | | | | | | | |
8‑Apr‑1968 | Tampa | Clay | QF | | | Cox d. Zeljko Franulovic [CRO] | 6-4 7-5 | | | | | | | | | |
8‑Apr‑1968 | Tampa | Clay | R16 | | | Cox d. Dick Knight [USA] | 6-1 6-1 | | | | | | | | | |
1‑Apr‑1968 | San Juan | Hard | F | | | Cox d. Alan Fox [USA] | 6-2 6-1 4-6 2-6 6-2 | | | | | | | | | |
1‑Apr‑1968 | San Juan | Hard | SF | | | Cox d. Jim Mcmanus [USA] | 3-6 7-5 7-5 | | | | | | | | | |
1‑Apr‑1968 | San Juan | Hard | QF | | | Cox d. Tom Edlefsen [USA] | 6-3 6-4 | | | | | | | | | |
1‑Apr‑1968 | San Juan | Hard | R16 | | | Cox d. Herb Fitzgibbon [USA] | 12-10 8-6 | | | | | | | | | |
1‑Apr‑1968 | San Juan | Hard | R32 | | | Cox d. Josef Stabholz [ISR] | 6-1 6-2 | | | | | | | | | |
25‑Mar‑1968 | New York 1 | Carpet | R32 | | | Manuel Santana [ESP] d. Cox | 6-2 6-2 | | | | | | | | | |
18‑Mar‑1968 | Curacao | Hard | SF | | | Tom Okker [NED] d. Cox | 6-4 4-6 6-0 | | | | | | | | | |
18‑Mar‑1968 | Curacao | Hard | QF | | | Cox d. Jan Kodes [CZE] | 6-1 6-3 | | | | | | | | | |
18‑Mar‑1968 | Curacao | Hard | R16 | | | Cox d. Jim Mcmanus [USA] | 6-3 2-6 6-1 | | | | | | | | | |
18‑Mar‑1968 | Curacao | Hard | R32 | | | Cox d. Donnie Haseth [CUW] | 6-0 6-1 | | | | | | | | | |
11‑Mar‑1968 | Caracas | Hard | R32 | | | Jan Kukal [CZE] d. Cox | 7-9 6-2 6-4 | | | | | | | | | |
4‑Mar‑1968 | Barranquilla | Clay | SF | | | Marty Riessen [USA] d. Cox | 6-0 6-3 6-4 | | | | | | | | | |
4‑Mar‑1968 | Barranquilla | Clay | QF | | | Cox d. Ingo Buding [GER] | 6-3 4-6 6-1 | | | | | | | | | |
4‑Mar‑1968 | Barranquilla | Clay | R16 | | | Cox d. Gardnar Mulloy [USA] | 6-3 6-3 | | | | | | | | | |
4‑Mar‑1968 | Barranquilla | Clay | R32 | | | Cox d. Richard Russell [JAM] | 6-1 6-1 | | | | | | | | | |
26‑Feb‑1968 | Kingston | Hard | SF | | | Tom Okker [NED] d. Cox | 6-1 6-2 | | | | | | | | | |
26‑Feb‑1968 | Kingston | Hard | QF | | | Cox d. Jim Osborne [USA] | 6-3 6-1 | | | | | | | | | |
26‑Feb‑1968 | Kingston | Hard | R16 | | | Cox d. Mervyn Morris [JAM] | 6-1 6-3 | | | | | | | | | |
20‑Feb‑1968 | Macon | Hard | R16 | | | Jim Mcmanus [USA] d. (8)Cox | 6-1 6-2 | | | | | | | | | |
12‑Feb‑1968 | Salisbury | Hard | R16 | | | Cliff Richey [USA] d. Cox | 6-4 6-4 | | | | | | | | | |
12‑Feb‑1968 | Salisbury | Hard | R32 | | | Cox d. Ron Holmberg [USA] | 11-9 1-6 6-2 | | | | | | | | | |
10‑Feb‑1968 | Pittsburgh Indoors | Carpet | F | | | Cox d. Bob Lutz [USA] | 6-4 2-6 7-5 | | | | | | | | | |
10‑Feb‑1968 | Pittsburgh Indoors | Carpet | SF | | | Cox d. Tom Edlefsen [USA] | 6-2 6-3 | | | | | | | | | |
10‑Feb‑1968 | Pittsburgh Indoors | Carpet | QF | | | Cox d. Stan Smith [USA] | 6-3 7-5 | | | | | | | | | |
14‑Jan‑1968 | Durban 1 | Hard | QF | | | Marty Riessen [USA] d. Cox | 6-4 6-4 6-4 | | | | | | | | | |
14‑Jan‑1968 | Durban 1 | Hard | R16 | | | Cox d. Thomaz Koch [BRA] | 6-0 11-9 6-3 | | | | | | | | | |
14‑Jan‑1968 | Durban 1 | Hard | R32 | | | Cox d. DUPE Rohan Summers [RSA] | 6-2 6-1 6-3 | | | | | | | | | |
14‑Jan‑1968 | Durban 1 | Hard | R64 | | | Cox d. Andrew Pattison [USA] | 6-4 6-1 6-3 | | | | | | | | | |
8‑Jan‑1968 | Bloemfontein | Hard | R16 | | | Torben Ulrich [DEN] d. Cox | 6-3 6-3 | | | | | | | | | |
8‑Jan‑1968 | Bloemfontein | Hard | R32 | | | Cox d. Andrew Pattison [USA] | 6-1 8-6 | | | | | | | | | |
8‑Jan‑1968 | Bloemfontein | Hard | R64 | | | Cox d. Dennis Breetzke [RSA] | 6-1 6-1 | | | | | | | | | |
2‑Jan‑1968 | Port Elizabeth | | R16 | | | Jan Leschly [DEN] d. Cox | 6-1 6-0 | | | | | | | | | |
1‑Jan‑1968 | Cape Town | | SF | | | Robert Maud [RSA] d. Cox | 6-4 6-2 | | | | | | | | | |
1‑Jan‑1968 | Cape Town | | QF | | | Cox d. Hans Jaochim Plotz [GER] | 6-2 6-1 | | | | | | | | | |
1‑Jan‑1968 | Cape Town | | R16 | | | Cox d. Paul Hutchins [GBR] | 6-2 6-1 | | | | | | | | | |
1‑Jan‑1968 | Cape Town | | R32 | | | Cox d. Andre Van Der Merwe B [RSA] | 6-2 6-1 | | | | | | | | | |
1‑Jan‑1968 | Cape Town | | R64 | | | Cox d. John Yuill [RSA] | 6-4 6-4 | | | | | | | | | |