| Masaki Jyonai | |
|---|---|
| Nationality | Japanese | 
| Born | 9 September 1962 Aichi Prefecture, Japan  | 
| Super GT career | |
| Debut season | 1997 | 
| Current team | R'Qs Motorsports | 
| Racing licence | |
| Car number | 22 | 
| Former teams | SigmaTec Racing Team, Team Gaikokuya, Arktech Motorsports, Team LeyJun, A&S Racing, Tomei Sports | 
| Starts | 153 | 
| Wins | 2 | 
| Podiums | 5 | 
| Poles | 0 | 
| Fastest laps | 0 | 
| Best finish | 5th in 1997 | 
Masaki Jyonai (城内 政樹, Jōnai Masaki, born 9 September 1962)[1] is a Japanese racing driver and businessman.
Racing career
Jyonai started karting in 1988; he is noted for his extensive experience in kart racing, having won numerous karting championships. He moved to car racing in 1993, racing in the Suzuka 1000 km in the Proto 2 class; he won on his debut.[2]
Jyonai began competing in Super GT in 1997 with the SigmaTec Racing Team. As of 2023, he has won two races;[2] his best finish in the championship is 5th, achieved in his first year in the series. Outside of racing, Jyonai is the CEO and President of Marusho Co. Ltd., a company involved in the lighting, security and construction sectors.[3] He is also a lecturer at the karting classes of Honda Racing School Suzuka as well as a color commentator for various television programs.
He occasionally competes using the pseudonym Guts Jyonai (Guts城内, Gattsu Jōnai);[2] Jyonai says he took the name from comedian Guts Ishimatsu. In more recent years he has reverted to using his real name.[1]
Racing record
Complete Super GT results
(key) (Races in bold indicate pole position) (Races in italics indicate fastest lap)
| Year | Team | Car | Class | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | DC | Points | 
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1997 | SigmaTec Racing Team | Porsche 911 GT2 | GT300 | SUZ | FUJ 6  | 
SEN 7  | 
FUJ 6  | 
MIN 2  | 
SUG 1  | 
5th | 51 | |||
| 1998 | GT300 | SUZ Ret  | 
FUJ C  | 
SEN 9  | 
FUJ 4  | 
MOT | MIN | SUG 16  | 
21st | 12 | ||||
| 1999 | GT300 | SUZ DSQ  | 
FUJ 3  | 
SUG 6  | 
MIN 11  | 
FUJ 19  | 
TAI Ret  | 
MOT DNS  | 
15th | 18 | ||||
| 2000 | GT300 | MOT | FUJ 12  | 
SUG 4  | 
FUJ Ret  | 
TAI 4  | 
MIN 7  | 
SUZ 5  | 
11th | 32 | ||||
| 2001 | Toyota MR-S | GT300 | TAI Ret  | 
FUJ | SUG Ret  | 
FUJ Ret  | 
MOT Ret  | 
SUZ 11  | 
MIN 1  | 
14th | 20 | |||
| 2002 | GT300 | TAI 14  | 
FUJ 2  | 
SUG Ret  | 
SEP | 
FUJ Ret  | 
MOT 10  | 
MIN 13  | 
SUZ 6  | 
15th | 24 | |||
| 2003 | GT300 | TAI 4  | 
FUJ 7  | 
SUG Ret  | 
FUJ 18  | 
FUJ | MOT | AUT | SUZ | 16th | 16 | |||
| Toyota Celica | TAI | FUJ | SUG | FUJ | FUJ Ret  | 
MOT | AUT | SUZ | ||||||
| 2004 | Team Gaikokuya | Porsche 911 GT3-R | GT300 | TAI 13  | 
SUG 21  | 
SEP | 
TOK | MOT | AUT | SUZ | 20th | 2 | ||
| Arktech Motorsports | Porsche 911 GT3 | TAI | SUG | SEP | TOK 20  | 
MOT 9  | 
AUT | SUZ 17  | 
||||||
| 2005 | Team LeyJun | Porsche 968 GT4 | GT300 | OKA Ret  | 
FUJ Ret  | 
SEP NC  | 
SUG 16  | 
MOT DSQ  | 
FUJ 14  | 
AUT Ret  | 
SUZ Ret  | 
NC | 0 | |
| 2006 | Porsche 911 GT3 | GT300 | SUZ Ret  | 
OKA | FUJ 16  | 
SEP | SUG | SUZ 15  | 
MOT 23  | 
AUT | FUJ 25  | 
37th | 1 | |
| 2007 | A&S Racing | Mosler MT900R | GT300 | SUZ Ret  | 
OKA 23  | 
FUJ Ret  | 
SEP | SUG | SUZ | MOT | AUT | FUJ | NC | 0 | 
| Arktech Motorsports | Porsche Boxster | SUZ | OKA | FUJ | SEP | SUG 17  | 
SUZ Ret  | 
MOT | AUT 17  | 
FUJ 19  | ||||
| 2008 | GT300 | SUZ 15  | 
OKA | FUJ | SEP | SUG | SUZ | MOT | AUT | FUJ | NC | 0 | ||
| Tomei Sports | Porsche 911 GT3 | SUZ | OKA | FUJ | SEP | SUG | SUZ 16  | 
MOT | AUT 16  | 
FUJ 15  | ||||
| 2010 | R'Qs Motorsports | Vemac RD350R | GT300 | SUZ | OKA | FUJ | SEP | SUG | SUZ 13  | 
FUJ C  | 
MOT 18  | 
NC | 0 | |
| 2011 | GT300 | OKA 13  | 
FUJ 13  | 
SEP 16  | 
SUG Ret  | 
SUZ 19  | 
FUJ | AUT 14  | 
MOT | NC | 0 | |||
| 2012 | GT300 | OKA 16  | 
FUJ 12  | 
SEP 18  | 
SUG DNQ  | 
SUZ 12  | 
FUJ 16  | 
AUT 18  | 
MOT | NC | 0 | |||
| 2013 | Mercedes-Benz SLS AMG GT3 | GT300 | OKA Ret  | 
FUJ 13  | 
SEP Ret  | 
SUG 19  | 
SUZ 12  | 
FUJ 17  | 
FSW | AUT 14  | 
MOT 16  | 
NC | 0 | |
| 2014 | GT300 | OKA | FUJ | AUT | SUG | FUJ 11  | 
SUZ 15  | 
CHA 9  | 
MOT 14  | 
35th | 2 | |||
| 2015 | GT300 | OKA DNS  | 
FUJ | CHA 15  | 
FUJ 10  | 
SUZ 16  | 
SUG 10  | 
AUT 22  | 
MOT 24  | 
32nd | 2 | |||
| 2016 | GT300 | OKA 19  | 
FUJ Ret  | 
SUG 20  | 
FUJ Ret  | 
SUZ 23  | 
CHA 18  | 
MOT 21  | 
MOT 21  | 
NC | 0 | |||
| 2017 | GT300 | OKA 24  | 
FUJ 23  | 
AUT 26  | 
SUG | FUJ 26  | 
SUZ 21  | 
CHA | MOT 25  | 
NC | 0 | |||
| 2018 | Mercedes-AMG GT3 | GT300 | OKA 19  | 
FUJ 25  | 
SUZ 25  | 
CHA | FUJ 21  | 
SUG DNQ  | 
AUT 25  | 
MOT 28  | 
NC | 0 | ||
| 2019 | GT300 | OKA 17  | 
FUJ 20  | 
SUZ 26  | 
CHA | FUJ 23  | 
AUT Ret  | 
SUG | MOT 26  | 
NC | 0 | |||
| 2020 | GT300 | FUJ 24  | 
FUJ 28  | 
SUZ 23  | 
MOT Ret  | 
FUJ | SUZ 26  | 
MOT 28  | 
FUJ 27  | 
NC | 0 | |||
| 2021 | Mercedes-AMG GT3 EVO 2020 | GT300 | OKA 20  | 
FUJ Ret  | 
SUZ 28  | 
MOT 21  | 
SUG | AUT Ret  | 
MOT | FUJ | NC | 0 | ||
| 2022 | GT300 | OKA 25  | 
FUJ Ret  | 
SUZ | FUJ 20  | 
SUZ 21  | 
SUG 24  | 
AUT 24  | 
MOT 22  | 
NC | 0 | |||
| 2023 | GT300 | OKA 20  | 
FUJ 21  | 
SUZ 26  | 
FUJ 24  | 
SUZ 20  | 
SUG 16  | 
AUT 21  | 
MOT 22  | 
NC | 0 | 
* Season still in progress.
References
- 1 2 "2023 城内 政樹". Super GT (in Japanese). Retrieved 27 June 2023.
 - 1 2 3 "2006 Driver Information". Super GT (in Japanese). Retrieved 27 June 2023.
 - ↑ "メッセージ (代表 城内 政樹)". marusho-cl.com (in Japanese). Retrieved 27 June 2023.
 
External links
- Masaki Jyonai career summary at DriverDB.com