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Date
Winner
Loser
Tournament
Round
Score
1974-10-13
Jurgen Fassbender (47)
Isao Watanabe ()
Tokyo
R32
7-5 6-1
1974-10-13
Isao Watanabe ()
Ian Fletcher (82)
Tokyo
R64
W/O
1974-04-08
Tito Vazquez (122)
Isao Watanabe ()
Tokyo WCT
R32
5-7 6-2 6-1
1970-03-14
Isao Watanabe ()
Kenneth Tsui ()
Davis Cup G2 QF: HKG vs JPN
RR
6-0 6-0 6-2
1968-08-13
Alex Kurucz ()
Isao Watanabe ()
Hamburg
R64
6-0 6-3 7-5
1968-07-22
Jan Kodes ()
Isao Watanabe ()
Hilversum
R16
6-1 6-1
1968-07-22
Isao Watanabe ()
Henk Nijeboer ()
Hilversum
R32
6-0 6-4
1968-07-22
Isao Watanabe ()
Hans Hartoch ()
Hilversum
R64
6-4 6-1
1968-07-21
Jaime Pinto Bravo ()
Isao Watanabe ()
Gstaad
R32
6-8 7-5 6-3
1968-07-08
Nicola Spear ()
Isao Watanabe ()
Dusseldorf
R32
6-3 6-3
1968-07-08
Isao Watanabe ()
Matthias Mauritz ()
Dusseldorf
R64
6-3 6-1
1968-06-10
Jim Osborne ()
Isao Watanabe ()
Bristol
R16
3-6 6-3 7-5
1968-06-10
Isao Watanabe ()
Allan Skelton ()
Bristol
R32
3-6 6-3 6-3
1968-05-27
Ashley Cooper ()
Isao Watanabe ()
Roland Garros
R128
W/O