Player data updated: 2026-09-01 02:16 UTC

Isao Watanabe

JPN Age 84 Plays: Right-Handed ATP Tour years active: 1968–1974

Isao Watanabe represented Japan on the ATP Tour and reached a career-high ranking of No. 274. In TennisDB's records, Isao Watanabe finished with a career record of 5–8 and no singles titles.

Peak ranking

274 (Dec 23, 1974)

Elo peak

1518 (8th percentile)

Career record

5–8 (38.5%)

Career titles

Records cover recorded main-draw singles results in TennisDB's ATP event archive, including credited walkovers; qualifying is shown separately below.

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ATP Matches full match log →

Isao Watanabe's recent, live, and scheduled ATP matches
Opponent	Score	Result	H2H	Match Data	Date	Round	Tournament	Category	Surface
Jurgen Fassbender	5-7 1-6	L	H2H	Match data	Oct 16, 1974*	R32	Tokyo	ATP 250	Hard
Ian Fletcher	(w/o)	W	H2H	Match data	Oct 15, 1974*	R64	Tokyo	ATP 250	Hard
Tito Vazquez	7-5 2-6 1-6	L	—	Match data	Apr 11, 1974*	R32	Japan Open	ATP 250	Clay
Alex Kurucz	0-6 3-6 5-7	L	—	Match data	Aug 15, 1968*	R64	Hamburg Open	ATP 250	Clay
Jan Kodes	1-6 1-6	L	H2H	Match data	Jul 26, 1968*	R16	Dutch Open	ATP 250	Clay

Rivals all rivalries →

Isao Watanabe's most-played ATP rivals
Opponent	W	L	M	Last Played	H2H
Jurgen Fassbender	0	1	1	Oct 16, 1974	H2H
Ian Fletcher	1	0	1	Oct 15, 1974	H2H
Tito Vazquez	0	1	1	Apr 11, 1974	—
Alex Kurucz	0	1	1	Aug 15, 1968	—
Jan Kodes	0	1	1	Jul 26, 1968	H2H

Career Results

Isao Watanabe career results by season
Season	Age	W	L	M	Win %	Start Rank	End Rank
1968	26	4	6	10	40.0%	—	—
1974	32	1	2	3	33.3%	297	274
Career		5	8	13	38.5%	—	—

Career Results by Surface

Isao Watanabe career results by season and surface
Season	Age	Hard				Clay				Grass				Total
Season	Age	W	L	M	Win %	W	L	M	Win %	W	L	M	Win %	W	L	M	Win %
1968	26	—	—	—	—	3	5	8	37.5%	1	1	2	50.0%	4	6	10	40.0%
1974	32	1	1	2	50.0%	0	1	1	0.0%	—	—	—	—	1	2	3	33.3%
Career	—	1	1	2	50.0%	3	6	9	33.3%	1	1	2	50.0%	5	8	13	38.5%

Advanced Stats

Isao Watanabe advanced statistics by season
Season	Age	Elo	P+	Serve+	Return+	PD	TPW%	Hard Elo	Clay Elo	Grass Elo	Set Win %	Set Margin	Dec. Set	Tiebreak	Pressure+	Schedule
1968	26	1479	100.2	—	—	—	—	—	+2	—	45.5%	-0.27	1–2 (33%)	—	—	+0.33
1974	32	1459	97.5	—	—	—	—	—	—	—	20.0%	-2.80	0–1	—	—	+0.19
Career		1518	99.2	—	—	—	—	—	+2	—	40.7%	-0.74	1–3 (25%)	—	—	+4.73

Tournament Results by Category

Grand Slams

Isao Watanabe Grand Slams results by season
Season	Age	RG	W-L Win %
1968	26	R128	0–1 (0%)
W-L		0–1 (0%)	0–1 (0%)

ATP 250

Isao Watanabe ATP 250 results by season
Season	Age	GST	HAM	TKY	BRI	DUS	DUT	W-L Win %
1968	26	R32	R64	—	R16	R32	R16	4–5 (44%)
1974	32	—	—	R32	—	—	—	1–1 (50%)
W-L		0–1 (0%)	0–1 (0%)	1–1 (50%)	1–1 (50%)	1–1 (50%)	2–1 (67%)	5–6 (45%)

Results show the best round reached per tournament and season.

ATP Ranking History full ranking history →

Career high

274

Career-high date

Dec 23, 1974

First Top 100

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First Top 50

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First Top 20

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First Top 10

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Ranking History Matrix

Isao Watanabe ranking history by month and season
Season	Age	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec
1974	32	—	—	—	—	—	—	—	—	—	—	297	274
1975	33	281	—	306	324	333	330	—	—	—	—	—	—

Similar Players

Other ATP players with comparable peak level, era, career record, and career scale.

Isao Watanabe's most statistically similar ATP players
Player	Country	Peak Rank	Peak Elo	M	W	L	Win %	Years	Match Log
Max Senior	AUS	276	1,531	10	4	6	40.0%	1968–1974	Match log
Abe Segal	RSA	275	1,550	24	9	15	37.5%	1968–1972	Match log
Mike Phillips	AUS	270	1,500	17	6	11	35.3%	1970–1974	Match log
Graydon Garner	RSA	272	1,517	33	12	21	36.4%	1968–1975	Match log
Per Jemsby	SWE	255	1,630	12	5	7	41.7%	1969–1974	Match log
Sever Muresan	ROU	297	1,515	8	3	5	37.5%	1968–1973	Match log
Colin Stubs	AUS	274	1,584	48	21	27	43.8%	1968–1975	Match log
Jean Paul Meyer	FRA	265	1,528	43	15	28	34.9%	1968–1975	Match log
Pekka Saila	FIN	272	1,535	14	4	10	28.6%	1968–1975	Match log
Ashley Cooper	AUS	278	1,500	3	1	2	33.3%	1968–1973	Match log
George Rudman	RSA	258	1,526	17	6	11	35.3%	1968–1981	Match log
Lawrence Hall	AUS	308	1,531	10	4	6	40.0%	1968–1982	Match log

Frequently Asked Questions

How old is Isao Watanabe?: Isao Watanabe is 84 years old, born on November 23, 1941.
Which country does Isao Watanabe represent?: Isao Watanabe represents Japan in TennisDB's ATP records.
Is Isao Watanabe left-handed or right-handed?: Isao Watanabe plays right-handed.
How many Grand Slams has Isao Watanabe won?: Isao Watanabe has not won a Grand Slam title.
How many Masters 1000 titles has Isao Watanabe won?: TennisDB does not group any of Isao Watanabe's titles under the modern Masters 1000 category.
What is Isao Watanabe's highest ATP ranking?: Isao Watanabe's career-high ATP singles ranking is world No. 274, first achieved on December 23, 1974.
What is Isao Watanabe's career win-loss record?: Isao Watanabe has a career ATP singles record of 5 wins and 8 losses (38.5%).
Which seasons of Isao Watanabe's career appear in TennisDB?: Isao Watanabe appears in TennisDB's ATP main-tour match records from 1968 through 1974.
Who has Isao Watanabe faced most often?: Isao Watanabe's most frequent opponent is Jurgen Fassbender, with a head-to-head record of 0–1 across 1 meeting.