Masaki Jyonai

Masaki Jyonai (城内 政樹, Jōnai Masaki, born 9 September 1962) is a Japanese racing driver and businessman.

Masaki Jyonai
Nationality	Japanese
Born	(1962-09-09) 9 September 1962 Aichi Prefecture, Japan
Super GT career
Debut season	1997
Current team	R'Qs Motorsports
Racing licence	FIA Bronze
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

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.

Jyonai began competing in Super GT in 1997 with the SigmaTec Racing Team. As of 2023, he has won two races; 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. 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); Jyonai says he took the name from comedian Guts Ishimatsu. In more recent years he has reverted to using his real name.

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.

External links

• Masaki Jyonai career summary at DriverDB.com