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Masashi Hosoya
細谷将司
	Hosoya with Yokohama in 2018
No. 0–Fukui Blowinds
Position	Point guard
League	B.League
Personal information
Born	October 2, 1989 (age 36); Ninomiya, Kanagawa, Japan
Listed height	5 ft 9 in (1.75 m)
Listed weight	160 lb (73 kg)
Career information
High school	Hatano Minamigaoka ; (Hadano, Kanagawa)
College	Kanto Gakuin University (2008–2012)
Playing career	2012–present
Career history
2012–2014	TGI D-Rise
2014-2015	Hyogo Storks
2015-2016	Tsukuba Robots
2016-2019	Yokohama B-Corsairs
2019-2021	Akita Northern Happinets
2021-2023	SeaHorses Mikawa
2023-present	Fukui Blowinds
Career highlights
	B.League All-Star (2020);

Masashi Hosoya

Last updated February 28, 2026

Masashi Hosoya (born October 2, 1989), nicknamed Mashi, is a Japanese professional basketball player who plays for the SeaHorses Mikawa of the B.League in Japan.^[1]^[2] He played college basketball for Kanto Gakuin University. On October 9, 2016, he recorded a career-high 39 points in a win to the San-en NeoPhoenix.^[3] The Ninomiya town native played soccer in his youth, and he is good at ball juggling.^[4]^[5]

Career statistics

Legend
GP	Games played	GS	Games started	MPG	Minutes per game
FG%	Field goal percentage	3P%	3-point field goal percentage	FT%	Free throw percentage
RPG	Rebounds per game	APG	Assists per game	SPG	Steals per game
BPG	Blocks per game	PPG	Points per game	Bold	Career high

Regular season


Year	Team	GP	GS	MPG	FG%	3P%	FT%	RPG	APG	SPG	BPG	TO	PPG
2012-13	TGI・D-Rise
2013-14	TGI・D-Rise	32	31	35.2	.397	.354	.805	0.3	3.4	0.8	0.1	3.4	16.9
2014-15	Hyogo	52	8	13.0	.319	.269	.875	0.1	0.7	0.2	0.0	0.6	3.1
2015-16	Tsukuba	53	35	24.9	.393	.335	.771	0.3	2.2	0.5	0.0	1.8	8.2
2016-17	Yokohama	56	42	26.8	.405	.364	.782	0.4	2.3	0.6	0.1	1.3	7.1
2017-18		58	47	23.2	.398	.356	.857	0.2	3.3	0.7	0.0	1.3	7.1
2018-19		55	8	19.9	.404	.353	.763	1.4	2.2	0.5	0.0	1.1	7.2
2019-20	Akita	37	12	18.6	.408	.347	.806	1.5	2.9	0.5	0.0	1.2	8.6
2020-21	Akita	59	4	13.9	.384	.325	.904	0.6	1.8	0.2	0.0	0.9	6.5

Playoffs


Year	Team	GP	GS	MPG	FG%	3P%	FT%	RPG	APG	SPG	BPG	PPG
2016-17	Yokohama	4	4	20:06	.364	.222	1.000	2.3	1.3	0.25	0.25	5.0
2016-17	Yokohama	1	1	24:12	.333	.200	1.000	4.0	3.0	0.0	0.0	7.0
2017-18	Yokohama	4	3	20:35	.500	.357	1.000	2.0	2.0	0.5	0.0	8.8
2018-19	Yokohama	3	0	6:38	.300	.200	.000	0.0	0.3	0.33	0.0	2.3

Early cup games


Year	Team	GP	GS	MPG	FG%	3P%	FT%	RPG	APG	SPG	PPG
2017	Yokohama	2	2	25:53	.364	.286	1.000	2.5	4.0	0.0	7.0
2018	Yokohama	2	2	24:34	.286	.286	.000	1.5	3.5	0.0	5.0
2019	Akita	2	0	20:38	.444	.462	.889	2.0	1.0	0.5	15.0

Preseason games


Year	Team	GP	GS	MPG	FG%	3P%	FT%	RPG	APG	SPG	BPG	PPG
2019	Akita	3	1	18.8	.448	.389	.667	2.0	2.3	1.7	0.0	13.0

Source: Utsunomiya Toyama Sendai

External links

Masashi Hosoya on Instagram

References

↑ Akita Northern Happinets (10 June 2019). "【新入団】細谷将司選手契約合意のお知らせ" . Retrieved 10 June 2019.
↑ "Masashi Hosoya heating up on offense for Yokohama". 22 November 2018.
↑ @B_LEAGUE (11 October 2016). "【三遠vs横浜】10/09 第3節GAME2｜横浜 #0 細谷将司選手（Age:27/PG/173cm）が3Pシュート7本を含む39得点をあげ大爆発！チームをB.LEAGUE初勝利へ導きました⚡@b_corsairs…" (Tweet) – via Twitter.
↑ @AKITA_NH (25 March 2020). "続きまして、マーシーのチャレンジ🔥さすが元サッカー部⚽️✨#細谷将司#ハッピーとワクワクを❣️#akitanh #In10sityForAkita #Bリーグ" (Tweet) – via Twitter.
↑ "特集1 第2回さむかわの若武者". 寒川町役場. 2018-09-28. Retrieved 2018-10-19.

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[1] Akita Northern Happinets (10 June 2019). "【新入団】細谷将司選手契約合意のお知らせ" . Retrieved 10 June 2019.

[2] "Masashi Hosoya heating up on offense for Yokohama". 22 November 2018.

[3] @B_LEAGUE (11 October 2016). "【三遠vs横浜】10/09 第3節GAME2｜横浜 #0 細谷将司選手（Age:27/PG/173cm）が3Pシュート7本を含む39得点をあげ大爆発！チームをB.LEAGUE初勝利へ導きました⚡@b_corsairs…" (Tweet) – via Twitter.

[4] @AKITA_NH (25 March 2020). "続きまして、マーシーのチャレンジ🔥さすが元サッカー部⚽️✨#細谷将司#ハッピーとワクワクを❣️#akitanh #In10sityForAkita #Bリーグ" (Tweet) – via Twitter.

[samukawa-5] "特集1 第2回さむかわの若武者". 寒川町役場. 2018-09-28. Retrieved 2018-10-19.

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