| 1968-09-21 | Davis Cup EUR F: JPN vs IND | - | RR | - |  Ramanathan Krishnan | - |  Koji Watanabe | 6-2 3-6 6-3 6-2 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-09-21 | Davis Cup EUR F: JPN vs IND | - | RR | - | Ramanathan Krishnan | - | Keishiro Yanagi | 6-4 6-3 6-1 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-11-09 | Davis Cup WG F: USA vs IND | Hard | RR | - | Ramanathan Krishnan | - |  Clark Graebner | 7-5 4-6 6-2 6-1 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-11-09 | Davis Cup WG F: USA vs IND | Hard | RR | - | Arthur Ashe | - | Ramanathan Krishnan | 6-1 6-3 6-3 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-10-04 | Davis Cup EUR SF: FRG vs IND | - | RR | - | Ramanathan Krishnan | - |  Ingo Buding | 6-2 7-5 6-2 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-10-04 | Davis Cup EUR SF: FRG vs IND | - | RR | - | Wilhelm Bungert | - | Ramanathan Krishnan | 4-6 6-0 8-6 7-5 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-08-29 | US Open | Grass | R64 | - |  John Newcombe (4) | - | Ramanathan Krishnan | 6-4 6-4 6-2 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-08-29 | US Open | Grass | R128 | - | Ramanathan Krishnan | - | Warren Jacques | 14-12 2-6 6-0 6-4 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-08-12 | Toronto | Clay | R32 | - | Ramanathan Krishnan | - |  Michael Carpenter | 6-0 6-0 6-1 | H2H | 5 | - | - | - | - | - | - | - |
| 1968-08-12 | Toronto | Clay | R64 | - | Ramanathan Krishnan | - | Doug Tough | 6-1 6-0 6-2 | H2H | 5 | - | - | - | - | - | - | - |
