1‑Sep‑1971 | US Open | Grass | R32 | | | (4)Tom Okker [NED] d. Sakai | 6-1 6-1 6-1 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | R64 | | | Sakai d. Ross Case [AUS] | 6-3 7-6 6-3 | | | | | | | | | |
1‑Sep‑1971 | US Open | Grass | R128 | | | Sakai d. Vitas Gerulaitis [USA] | 6-4 2-6 1-6 6-4 6-1 | | | | | | | | | |
19‑Jul‑1971 | Kitzbuhel | Clay | R32 | | | Clark Graebner [USA] d. Sakai | 6-2 6-4 6-3 | | | | | | | | | |
5‑Jul‑1971 | Munich | Clay | R32 | | | Han Jurgen Pohmann [GER] d. Sakai | 6-0 9-11 7-5 6-1 | | | | | | | | | |
21‑Jun‑1971 | Wimbledon | Grass | R128 | | | Frew Mcmillan [RSA] d. Sakai | 6-4 6-2 6-1 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R64 | | | Graham Stilwell [GBR] d. Sakai | 7-5 12-10 6-4 | | | | | | | | | |
21‑May‑1971 | Roland Garros | Clay | R128 | | | Sakai d. (Q)Bernard Paul [FRA] | 3-6 2-6 7-5 8-6 6-3 | | | | | | | | | |
15‑May‑1971 | Davis Cup EUR F: JPN vs IND | | RR | | | Jaidip Mukerjea [IND] d. Sakai | 6-0 6-0 6-4 | | | | | | | | | |
15‑May‑1971 | Davis Cup EUR F: JPN vs IND | | RR | | | Premjit Lall [IND] d. Sakai | 6-2 6-2 6-4 | | | | | | | | | |
23‑Apr‑1971 | Davis Cup AME F: JPN vs AUS | | RR | | | Sakai d. Colin Dibley [AUS] | 5-7 8-6 6-3 6-2 | | | | | | | | | |
23‑Apr‑1971 | Davis Cup AME F: JPN vs AUS | | RR | | | Sakai d. John Cooper [AUS] | 6-1 15-13 8-6 | | | | | | | | | |
2‑Apr‑1971 | Davis Cup AME SF: PHI vs JPN | | RR | | | Eddie Cruz [PHI] d. Sakai | 7-5 6-1 5-7 8-6 | | | | | | | | | |
2‑Apr‑1971 | Davis Cup AME SF: PHI vs JPN | | RR | | | Sakai d. Raymundo Deyro [PHI] | 6-4 6-2 6-3 | | | | | | | | | |
23‑Jan‑1971 | Melbourne | Grass | R16 | | | Phil Dent [AUS] d. Sakai | 6-2 7-6 7-6 | | | | | | | | | |
23‑Jan‑1971 | Melbourne | Grass | R32 | | | Sakai d. Sutarjo Sugiarto [INA] | 6-2 6-2 7-6 | | | | | | | | | |
23‑Jan‑1971 | Melbourne | Grass | R64 | | | Sakai d. Graeme Thomson [AUS] | 6-2 6-2 6-3 | | | | | | | | | |
18‑Jan‑1971 | Sydney Outdoor | Hard | R64 | | | Greg Perkins [AUS] d. Sakai | 6-3 6-1 | | | | | | | | | |