| Tsuyoshi Yamaguchi |
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| Born | (1984-11-21) 21 November 1984
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| Curling club | SC Karuizawa Club, Karuizawa, Nagano |
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| Skip | Tsuyoshi Yamaguchi |
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| Fourth | Riku Yanagisawa |
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| Second | Takeru Yamamoto |
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| Lead | Satoshi Koizumi |
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| Alternate | Shingo Usui |
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Mixed doubles partner | Miyu Ueno |
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| Member Association | Japan |
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World Championship appearances | 8 (2009, 2013, 2014, 2015, 2016, 2017, 2023, 2025) |
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World Mixed Doubles Championship appearances | 3 (2018, 2019, 2024) |
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Pacific-Asia Championship appearances | 9 (2007, 2008, 2009, 2012, 2013, 2014, 2015, 2016, 2017) |
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Pan Continental Championship appearances | 2 (2022, 2023) |
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World Junior Curling Championship appearances | 1 (2002) |
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Olympic appearances | 1 (2018) |
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Tsuyoshi Yamaguchi (山口 剛史, Yamaguchi Tsuyoshi, born 21 November 1984) is a Japanese curler from Karuizawa, Nagano.