Cobyn Mattson | CompSeek

Hawaii Tenri Judo September 27, 2026 Tournament 2026-09-27

🥇 1st Cadet Male / Middle weight · 🥇 1st Juvenile Male / heavy weight

Won vs Derrick Yoshizumi (Salt Lake Judo Hawaii)
Cadet Male / Middle weight · Round 3 · ippon
Won vs Ethan Luke (Hawaii Tenri Judo)
Cadet Male / Middle weight · Round 1 · ippon
Won vs Jairus Ikeda (Waiau Judo Club)
Cadet Male / Middle weight · Round 2 · ippon
Won vs Ty Mounthongdy (Hawaii Tenri Judo)
Juvenile Male / heavy weight · Round 2 · ippon
Won vs Ty Mounthongdy (Hawaii Tenri Judo)
Juvenile Male / heavy weight · Round 1 · ippon

Shudokan Uemura Cup 2026 ★ Hawaii International Judo Championships 2026-08-29

🥈 2nd Male Juvenile A / Open / Age 14 and Under / -141 lbs

Lost vs Kean Masangcay (Hilo Hongwanji Judo Club)
Male Juvenile B / Open / Age 16 and Under / -132 lbs · Round 3 · ippon
Won vs Wes Kishimoto (Kazoku Judo Academy)
Male Juvenile B / Open / Age 16 and Under / -132 lbs · Round 2 · ippon
Lost vs Ace Kobayakawa (修道館 - SHUDOKAN JUDO CLUB)
Male Juvenile B / Open / Age 16 and Under / -132 lbs · Round 2 · ippon
Won vs Derrick Yoshizumi (Salt Lake Judo Hawaii)
Male Juvenile B / Open / Age 16 and Under / -132 lbs · Round 1 · ippon
Lost vs Hinata Mukou (Uji Judokai - Kyoto, Japan )
Male Juvenile A / Open / Age 14 and Under / -141 lbs · Round 3 · yuko
Won vs Ethan Higa (Higashi Hongwanji Judo Club)
Male Juvenile A / Open / Age 14 and Under / -141 lbs · Round 2 · ippon

Hawaii Tenri Judo August 2, 2026 Tournament 2026-08-02

🥇 1st Juvenile Male / Over 55 kg · 🥈 2nd Senior Men

Won vs Luca Oishi (Manoa Judo Club)
Senior Men · Round 3 · ippon
Lost vs Casey Iwata (Hawaii Tenri Judo)
Senior Men · Round 2 · yuko
Won vs Ty Mounthongdy (Hawaii Tenri Judo)
Juvenile Male / Over 55 kg · Round 2 · ippon
Won vs Ty Mounthongdy (Hawaii Tenri Judo)
Juvenile Male / Over 55 kg · Round 1 · ippon

2026 USA Judo Junior Olympic National Championships 2026-06-19

Lost vs Blake Clark (Joplin Judo & JiuJitsu)
Juvenile Male / Under 60kg · Round 3 · ippon
▶ Watch at 5:44:28
Won vs Kasen Shivers (McCall Judo Club)
Juvenile Male / Under 60kg · Round 2 · ippon
Won vs Enguun Nyam-Ochir (Nyam-Ochir Training Center (NOTC))
Juvenile Male / Under 60kg · Round 1 · ippon
▶ Watch at 5:03:18
Lost vs Henry Hagen (Highlands Judo Dojo)
Juvenile Male / Under 60kg · Round 1 · ippon
▶ Watch at 4:31:02

Warriors Quest 50th SJA Judo Tournament 2026-04-19

🥇 1st Male Juvenile B / 132

Won vs Esiah-James Fines (Hawaii Boys & Girls Club Judo)
Male Juvenile B / 132 · Round 5 · ippon
Won vs Esiah-James Fines (Hawaii Boys & Girls Club Judo)
Male Juvenile B / 132 · Round 3 · ippon
Won vs Jesaiah Maddela (Kazoku Judo Academy)
Male Juvenile B / 132 · Round 2 · ippon
Won vs Jairus Ikeda (Waiau Judo Club)
Male Juvenile B / 132 · Round 1 · ippon

Warriors Quest 50th State Judo Association hosted by Aiea Taiheiji 2026-01-18

🥇 1st Male Juvenile B / 132

Won vs Nigel Hoshino (Pearl City Hongwanji Judo Club)
Male Juvenile B / 132 · Round 6 · yuko
Won vs Nigel Hoshino (Pearl City Hongwanji Judo Club)
Male Juvenile B / 132 · Round 5 · ippon
Won vs Trevor Matsuwaki (Hawaii Judo Academy)
Male Juvenile B / 132 · Round 4 · ippon
Won vs Jairus Ikeda (Waiau Judo Club)
Male Juvenile B / 132 · Round 3 · ippon
Won vs Jordy Yasuda (Waiau Judo Club)
Male Juvenile B / 132 · Round 2 · ippon
Lost vs Nigel Hoshino (Pearl City Hongwanji Judo Club)
Male Juvenile B / 132 · Round 2 · ippon
Won vs Jairus Ikeda (Waiau Judo Club)
Male Juvenile B / 132 · Round 1 · ippon

Warriors Quest 50th State Judo Association - Mahalo to 2025 with Santa Claus! 2025-12-07

🥉 3rd Male Juvenile B / 121

Lost vs Kent Murai (Shobukan Judo Club)
Male Juvenile B / 121 · Round 3 · ippon
Won vs Wes Kishimoto (Kazoku Judo Academy)
Male Juvenile B / 121 · Round 2 · yuko
Lost vs David Sakai (Shudokan Judo Club)
Male Juvenile A / 128 · Round 3 · ippon
Won vs Keenan Tubon (Mililani Seidokan Judo Club)
Male Juvenile A / 128 · Round 2 · ippon
Lost vs Kolten Sewake (Shudokan Judo Club)
Male Juvenile A / 128 · Round 2 · ippon
Won vs Mason Akamine (Mililani Seidokan Judo Club)
Male Juvenile A / 128 · Round 1 · ippon

Warriors Quest 50th State Judo Association hosted by Newtown Shinkansen 2025-11-09

🥇 1st Male Juvenile A / 128 · 🥈 2nd Male Juvenile B / 132

Won vs Brayden Baldevarona (Island Judo Hawaii)
Male Juvenile A / 128 · Round 5 · ippon
Won vs Brayden Baldevarona (Island Judo Hawaii)
Male Juvenile A / 128 · Round 3 · ippon
Lost vs Wes Kishimoto (Kazoku Judo Academy)
Male Juvenile B / 132 · Round 1 · ippon
Won vs Keenan Tubon (Mililani Seidokan Judo Club)
Male Juvenile A / 128 · Round 2 · ippon
Won vs Luca Oishi (Manoa Judo Club)
Male Juvenile B / 132 · Round 2 · ippon

Warriors Quest 50th State Judo Association hosted by Shobukan Judo Club 2025-10-12

🥇 1st Male Juvenile A / 128

Won vs Nigel Sarmiento (Pearl City Hongwanji Judo Club)
Male Juvenile A / 128 · Round 3 · hansokumake
Won vs Cole Yoneda (Waiau Judo Club)
Male Juvenile A / 128 · Round 2 · ippon

2025 Shudokan Uemura Cup Judo Championships 2025-08-23

🥉 3rd Male Juvenile A / Open / Age 14 and Under / -128 lbs

Won vs Lincoln Pascual-Tabuyo (Hawaii Tenri Judo)
Male Juvenile A / Open / Age 14 and Under / -128 lbs · Round 5 · ippon
Won vs Ace Kobayakawa (Shudokan Judo Club)
Male Juvenile A / Open / Age 14 and Under / -128 lbs · Round 4 · walkover
Won vs Nalei‘eha Inciong (Hilo Hongwanji Judo Club)
Male Juvenile A / Open / Age 14 and Under / -128 lbs · Round 3 · ippon
Lost vs Cayden Young (Shudokan Judo Club)
Male Juvenile A / Open / Age 14 and Under / -128 lbs · Round 2 · ippon
Won vs Tsuyoshi Haraguchi (Kurume Judo Juku)
Male Juvenile A / Open / Age 14 and Under / -128 lbs · Round 1 · ippon

Hawaii 2025 Summer Judo Nationals Usjf 2025-07-19

🥇 1st Male Juvenile A / 117

Won vs David Sakai (Shudokan Judo Club)
Male Juvenile A / 117 · Round 7 · ippon
Won vs Kolten Sewake (Shudokan Judo Club)
Male Juvenile A / 117 · Round 4 · ippon
Won vs Will Isenbarger (Manoa Judo Club)
Male Juvenile A / 117 · Round 3 · ippon
Won vs Laikahu Merseburgh (Hilo Hongwanji Judo Club)
Male Juvenile A / 117 · Round 2 · ippon
Won vs Micah Baniaga (Yokosuka Base Judo Club)
Male Juvenile A / 117 · Round 1 · ippon

America's Cup Judo Championships: Hawaii Edition 2025-07-04

🥇 1st Juvenile Pointed Division / 2011-2012 / Male / Pointed Division / -53kg

Won vs Joshua Son (Hawaii Boys & Girls Club Judo)
Juvenile Pointed Division / 2011-2012 / Male / Pointed Division / -53kg · Round 3 · ippon
▶ Watch at 1:15:01
Won vs Cole Yoneda (Waiau Judo Club)
Juvenile Pointed Division / 2011-2012 / Male / Pointed Division / -53kg · Round 2 · ippon
▶ Watch at 1:06:06
Lost vs Innozen Alberto (Washington Judo Academy)
Juvenile Pointed Division / 2011-2012 / Male / Pointed Division / -53kg · Round 1 · ippon
▶ Watch at 0:57:06

Warriors Quest 50th State Judo Association hosted by Kazoku Judo Academy 2025-04-13

🥇 1st Male Juvenile A / 117 · 🥈 2nd Male Juvenile A / 128

Lost vs Jairus Ikeda (Waiau Judo Club)
Male Juvenile A / 128 · Round 3 · wazari
Lost vs Nigel Sarmiento (Pearl City Hongwanji Judo Club)
Male Juvenile A / 128 · Round 3 · ippon
Won vs Cody Kitamori (Salt Lake Judo Hawaii)
Male Juvenile A / 128 · Round 2 · walkover
Won vs Colton Tollefson-Oili (Leeward Judo Club)
Male Juvenile A / 128 · Round 1 · ippon
Won vs Joshua Son (Hawaii Boys & Girls Club Judo)
Male Juvenile A / 117 · Round 3 · wazari
Won vs Lucas Wong (Wadokan Judo Association)
Male Juvenile A / 117 · Round 2 · ippon