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Date
Winner
Loser
Tournament
Round
Score
1972-03-29
Colin Dibley ()
Koji Watanabe ()
Hong Kong
R16
6-3 8-6
1972-03-29
Koji Watanabe ()
Charles Chang ()
Hong Kong
R32
6-3 6-0
1970-06-22
Ingo Buding ()
Koji Watanabe ()
Wimbledon
R128
7-5 6-3 4-6 6-3
1970-06-15
Stepan Koudelka ()
Koji Watanabe ()
London / Queen's Club
R64
6-4 7-5
1970-05-01
Francois Jauffret ()
Koji Watanabe ()
Roland Garros
R128
7-5 6-3 6-1
1970-04-17
Allan Stone ()
Koji Watanabe ()
Davis Cup AME F: JPN vs AUS
RR
8-6 7-9 6-4 6-0
1970-04-17
Dick Crealy ()
Koji Watanabe ()
Davis Cup AME F: JPN vs AUS
RR
9-11 6-2 6-1 3-6 6-3
1970-04-10
Koji Watanabe ()
Van Thanh Vo ()
Davis Cup WG SF: JPN vs VIE
RR
6-3 6-3 6-1
1970-04-10
Koji Watanabe ()
Van Bay Vo ()
Davis Cup WG SF: JPN vs VIE
RR
6-2 6-3 6-4
1969-08-11
Zeljko Franulovic ()
Koji Watanabe ()
Kitzbuhel
R16
6-4 8-10 6-2
1969-08-11
Koji Watanabe ()
Zlatko Ivancic ()
Kitzbuhel
R32
5-7 6-1 6-3
1969-07-27
Francois Jauffret ()
Koji Watanabe ()
Gstaad
R32
6-4 6-3
1969-07-14
Patricio Rodriguez Chi ()
Koji Watanabe ()
Aix-en-Provence
R32
9-7 6-3
1969-07-14
Koji Watanabe ()
Francois Battegay ()
Aix-en-Provence
R64
W/O
1969-06-23
Hans Joachim Ploetz ()
Koji Watanabe ()
Wimbledon
R64
9-7 3-6 9-7 9-7
1969-06-23
Koji Watanabe ()
Patrice Beust ()
Wimbledon
R128
6-3 7-5 6-3
1969-05-28
Rod Laver ()
Koji Watanabe ()
Roland Garros
R128
6-1 6-1 6-1
1969-05-10
Shiv Prakash Misra ()
Koji Watanabe ()
Davis Cup EUR F: IND vs JPN
RR
6-3 6-3 5-7 6-2
1969-05-10
Premjit Lall ()
Koji Watanabe ()
Davis Cup EUR F: IND vs JPN
RR
6-2 6-3 6-4
1969-04-18
Koji Watanabe ()
Eddie Cruz ()
Davis Cup AME SF: JPN vs PHI
RR
6-3 6-4 6-4
1969-04-18
Koji Watanabe ()
Raymundo Deyro ()
Davis Cup AME SF: JPN vs PHI
RR
6-2 6-1 6-2
1969-01-29
Raymond Moore ()
Koji Watanabe ()
Auckland
R16
7-5 6-4 4-6 8-6
1969-01-20
Bill Bowrey ()
Koji Watanabe ()
Australian Open
R64
8-6 6-4 6-3
1969-01-13
Andres Gimeno ()
Koji Watanabe ()
Sydney
R32
7-5 6-2 4-6 6-2
1969-01-06
Will Coghlan ()
Koji Watanabe ()
Melbourne
R32
2-6 8-6 6-4 7-5
1968-12-30
Fred Stolle ()
Koji Watanabe ()
Hobart
R16
9-7 6-2
1968-12-30
Koji Watanabe ()
R Campbell ()
Hobart
R32
7-5 6-2
1968-09-21
Koji Watanabe ()
Premjit Lall ()
Davis Cup EUR F: JPN vs IND
RR
8-6 6-1 6-2
1968-09-21
Ramanathan Krishnan ()
Koji Watanabe ()
Davis Cup EUR F: JPN vs IND
RR
6-2 3-6 6-3 6-2
1968-08-13
Wilhelm Bungert ()
Koji Watanabe ()
Hamburg
R16
6-3 6-3 7-5
1968-08-13
Koji Watanabe ()
Frew Mcmillan ()
Hamburg
R32
6-1 7-5 1-6 6-4
1968-08-13
Koji Watanabe ()
Uwe Gottschalk ()
Hamburg
R64
6-4 7-5 6-2
1968-07-22
Phil Dent ()
Koji Watanabe ()
Hilversum
R16
3-6 6-3 6-4
1968-07-22
Koji Watanabe ()
Paul Van Min ()
Hilversum
R32
6-3 6-4
1968-07-22
Koji Watanabe ()
Peter Ehrlich ()
Hilversum
R64
6-1 6-1
1968-07-21
Nikola Pilic ()
Koji Watanabe ()
Gstaad
R16
5-7 6-4 6-0
1968-07-21
Koji Watanabe ()
Giuseppe Merlo ()
Gstaad
R32
1-0 RET
1968-07-08
Milan Holecek ()
Koji Watanabe ()
Dusseldorf
R16
4-6 6-3 6-4
1968-07-08
Koji Watanabe ()
Hans Jurgen Pohmann ()
Dusseldorf
R32
0-6 6-2 7-6
1968-06-24
Jorgen Ulrich ()
Koji Watanabe ()
Wimbledon
R128
6-2 6-4 7-5
1968-06-10
Keith Carpenter ()
Koji Watanabe ()
Bristol
R32
8-6 6-4
1968-06-10
Koji Watanabe ()
J. Ockenden ()
Bristol
R64
6-2 8-6
1968-05-10
Koji Watanabe ()
Eddie Cruz ()
Davis Cup AME F: JPN vs PHI
RR
4-6 6-2 6-0 6-2
1968-03-23
Koji Watanabe ()
Yong Ho Chung ()
Davis Cup G2 SF: JPN vs KOR
RR
6-1 6-1 6-4