Kenley Jansen

Position: Pitcher

Bats: Both • Throws: Right

6-5, 265lb (196cm, 120kg)

Team: Boston Red Sox (majors)

Born: September 30, 1987 in Willemstad, Curacao cw

Debut: July 24, 2010 (Age 22-297d, 19,785th in major league history)
vs. NYM 1.0 IP, 0 H, 2 SO, 0 BB, 0 ER

Rookie Status: Exceeded rookie limits during 2011 season

2024 Contract Status: Signed thru 2024, 2 yrs/$32M (23-24)

Service Time (01/2024): 13.073 • Free Agent: 2025

Agents: Wasserman

Full Name: Kenley Geronimo Jansen

Nicknames: Kenleyfornia or Ma'montro

Pronunciation: \KEHN-lee JAN-sin\

Twitter: @kenleyjansen74

Instagram: @kenleyjansen74

View Player Info from the B-R Bullpen

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SUMMARY

2024

Career

WAR

0.3

20.9

ERA

2.35

2.52

825

425

7.2

821.1

1171

WHIP

1.565

0.962

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Team Record in Appearances: 38-13

Days of Rest

Inning/Score Appearance Matrix

Multiple inning appearances: 1, Entered with runners on base: 4

2023 Pitching Game Log

Click two rows to sum games (Clear)

2023 Pitching Game Log
Rk	Gcar	Gtm	Date	Tm		Opp	Rslt	Inngs	Dec	DR	IP	H	R	ER	BB	SO	HR	HBP	ERA	FIP	BF	Pit	Str	StL	StS	GB	FB	LD	PU	Unk	GSc	IR	IS	SB	CS	PO	AB	2B	3B	IBB	GDP	SF	ROE	aLI	WPA	acLI	cWPA	RE24	DFS(DK)	DFS(FD)	Entered	Exited
1	767	2	Apr 1	BOS		BAL	W,9-8	9-GF	W(1-0)	99	1.0	1	0	0	1	2	0	0	0.00	2.26	5	19	12	2	5	1	1	0	0	0		0	0	1	0	0	4	0	0	0	0	0	0	.79	0.043	.72	0.02%	0.54	9.05	15.00	9t --- 0 out d1	9t end d 1
2	768	7	Apr 6	BOS	@	DET	W,6-3	9-GF	S(1)	4	1.0	0	0	0	0	0	0	0	0.00	2.76	3	16	11	2	2	1	2	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	.56	0.044	.47	0.02%	0.52	2.25	3.00	9b --- 0 out a3	9b end a 3
3	769	9	Apr 9	BOS	@	DET	W,4-1	9-GF	S(2)	2	1.0	2	0	0	1	2	0	0	0.00	2.59	6	27	19	4	2	1	2	0	0	0		0	0	0	0	0	5	1	0	0	0	0	0	2.62	0.044	2.37	0.02%	0.52	4.45	9.00	9b --- 0 out a3	9b end a 3
4	770	14	Apr 14	BOS		LAA	W,5-3	9-GF	S(3)	4	1.0	1	0	0	0	3	0	0	0.00	1.26	4	13	11	3	4	0	1	0	0	0		0	0	0	0	0	4	0	0	0	0	0	0	1.09	0.080	.78	0.03%	0.54	7.65	12.00	9t --- 0 out a2	9t end a 2
5	771	15	Apr 15	BOS		LAA	W,9-7	9-GF	S(4)	0	1.0	0	0	0	0	0	0	0	0.00	1.66	3	7	7	2	1	0	3	1	1	0		0	0	0	0	0	3	0	0	0	0	0	0	1.02	0.080	.79	0.04%	0.54	2.25	3.00	9t --- 0 out a2	9t end a 2
6	772	18	Apr 18	BOS		MIN	W,5-4	9-9		2	1.0	0	0	0	0	2	0	0	0.00	1.26	3	13	9	2	2	0	1	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	1.87	0.146	1.59	0.07%	0.54	6.25	9.00	9t --- 0 out tie	9t 3 out tie
7	773	21	Apr 21	BOS	@	MIL	W,5-3	9-GF	S(5)	2	1.0	0	0	0	0	2	0	0	0.00	0.97	3	12	8	1	1	0	1	0	1	0		0	0	0	0	0	3	0	0	0	0	0	0	1.23	0.095	1.02	0.05%	0.52	6.25	9.00	9b --- 0 out a2	9b end a 2
8	774	25	Apr 25	BOS	@	BAL	W,8-6	9-GF	S(6)	3	0.2	0	0	0	0	0	0	0	0.00	1.17	2	11	9	2	1	1	1	1	0	0		0	0	0	0	0	2	0	0	0	0	0	0	.86	0.043	.74	0.02%	0.26	1.50	2.00	9b --- 1 out a2	9b end a 2
9	775	28	Apr 29	BOS		CLE	W,8-7	9-9	BS(1)	3	1.0	3	1	1	0	1	0	0	1.04	1.18	6	29	22	6	0	1	4	2	0	0		0	0	1	0	0	6	0	0	0	0	0	0	4.53	-0.183	3.41	-0.08%	-0.46	0.45	3.00	9t --- 0 out a1	9t 3 out tie
May				Tm		Opp	Rslt	Inngs	Dec	DR	IP	H	R	ER	BB	SO	HR	HBP	ERA	FIP	BF	Pit	Str	StL	StS	GB	FB	LD	PU	Unk	GSc	IR	IS	SB	CS	PO	AB	2B	3B	IBB	GDP	SF	ROE	aLI	WPA	acLI	cWPA	RE24	DFS(DK)	DFS(FD)	Entered	Exited
10	776	34	May 5	BOS	@	PHI	W,5-3	9-GF	S(7)	5	1.0	1	0	0	1	3	0	0	0.93	1.08	5	22	13	2	7	0	1	1	0	0		0	0	0	0	0	4	0	0	0	0	0	0	2.82	0.095	2.52	0.05%	0.52	7.05	12.00	9b --- 0 out a2	9b end a 2
11	777	35	May 6	BOS	@	PHI	W,7-4	9-GF	S(8)	0	1.0	1	0	0	0	1	0	0	0.84	1.10	4	14	11	0	2	1	2	1	0	0		0	0	0	0	0	4	0	0	0	0	0	0	1.15	0.043	1.03	0.02%	0.52	3.65	6.00	9b --- 0 out a3	9b end a 3
12	778	38	May 10	BOS	@	ATL	W,5-2	9-GF	S(9)	3	1.0	1	0	0	0	1	0	0	0.77	1.11	4	15	12	2	3	0	3	1	0	0		0	0	0	0	0	4	1	0	0	0	0	0	.87	0.047	.75	0.02%	0.55	3.65	6.00	9b --- 0 out a3	9b end a 3
13	779	39	May 12	BOS		STL	L,6-8	9-9	BL(1-1)	1	0.0	3	3	3	1	0	1	0	3.09	2.48	4	22	12	4	1	0	3	2	0	0		0	0	2	0	0	3	1	0	0	0	0	0	2.88	-0.772	2.67	-0.43%	-3.63	-8.40	-9.00	9t --- 0 out a1	9t -2- 0 out d2
14	780	40	May 13	BOS		STL	L,3-4	9-GF	BL(1-2)	0	1.0	1	3	2	3	0	0	0	4.26	3.26	7	17	8	3	1	2	2	1	1	0		0	0	1	0	0	4	1	0	1	0	0	0	3.59	-0.706	3.22	-0.38%	-2.46	-4.15	-3.00	9t --- 0 out a2	9t end d 1
15	781	46	May 20	BOS	@	SDP	W,4-2	9-GF	S(10)	6	1.0	0	0	0	2	0	0	0	3.95	3.69	5	19	8	4	0	0	3	0	2	0		0	0	1	0	0	3	0	0	0	0	0	0	2.05	0.091	1.83	0.05%	0.50	1.05	3.00	9b --- 0 out a2	9b end a 2
16	782	50	May 24	BOS	@	LAA	L,3-7	8-GF(8)		3	1.0	0	0	0	1	0	0	0	3.68	3.87	4	14	9	2	1	1	2	0	2	0		0	0	0	0	0	3	0	0	0	0	0	0	.02	0.002	.02	0.00%	0.53	1.65	3.00	8b --- 0 out d5	8b end d 5
17	783	52	May 27	BOS	@	ARI	W,2-1	9-GF	S(11)	2	1.0	0	0	0	0	1	0	0	3.45	3.70	3	13	9	2	2	0	2	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	2.70	0.208	2.12	0.10%	0.53	4.25	6.00	9b --- 0 out a1	9b end a 1
Jun				Tm		Opp	Rslt	Inngs	Dec	DR	IP	H	R	ER	BB	SO	HR	HBP	ERA	FIP	BF	Pit	Str	StL	StS	GB	FB	LD	PU	Unk	GSc	IR	IS	SB	CS	PO	AB	2B	3B	IBB	GDP	SF	ROE	aLI	WPA	acLI	cWPA	RE24	DFS(DK)	DFS(FD)	Entered	Exited
18	784	56	Jun 1	BOS		CIN	W,8-2	9-GF		4	1.0	0	0	0	1	0	0	0	3.24	3.86	4	13	6	2	0	1	2	0	1	0		0	0	0	0	0	3	0	0	0	0	0	0	.03	0.003	.02	0.00%	0.54	1.65	3.00	9t --- 0 out a6	9t end a 6
19	785	57	Jun 3(1)	BOS		TBR	W,8-5	9-GF	S(12)	1	1.0	1	0	0	0	3	0	0	3.06	3.48	4	16	11	2	4	0	1	1	0	0		0	0	0	0	0	4	1	0	0	0	0	0	.95	0.037	.75	0.02%	0.54	7.65	12.00	9t --- 0 out a3	9t end a 3
20	786	58	Jun 3(2)	BOS		TBR	L,2-4	9-GF	L(1-3)	-1	1.0	3	2	2	1	1	0	0	3.86	3.52	7	27	15	2	5	0	5	3	1	0		0	0	0	0	0	6	1	0	0	0	0	0	2.16	-0.400	1.82	-0.20%	-1.46	-2.15	0.00	9t --- 0 out tie	9t end d 2
21	787	61	Jun 6	BOS	@	CLE	W,5-4	9-GF	S(13)	2	1.0	0	0	0	0	1	0	0	3.66	3.41	3	13	9	3	3	1	1	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	2.62	0.199	1.44	0.07%	0.50	4.25	6.00	9b --- 0 out a1	9b end a 1
22	788	64	Jun 9	BOS	@	NYY	W,3-2	9-GF	S(14)	2	1.0	2	0	0	0	1	0	0	3.48	3.30	5	17	12	2	2	1	3	0	1	0		0	0	0	0	0	5	0	0	0	0	0	0	3.67	0.207	2.15	0.07%	0.52	3.05	6.00	9b --- 0 out a1	9b end a 1
23	789	66	Jun 11	BOS	@	NYY	W,3-2	9-9	W(2-3)	1	1.0	0	0	0	0	1	0	0	3.32	3.21	3	10	8	3	2	2	0	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	1.84	0.142	1.07	0.05%	0.52	8.25	12.00	9b --- 0 out tie	9b 3 out tie
24	790	67	Jun 12	BOS		COL	L,3-4	9-9		0	1.0	0	0	0	0	1	0	0	3.18	3.12	3	10	6	3	1	1	1	0	1	0		0	0	0	0	0	3	0	0	0	0	0	0	1.87	0.146	1.06	0.05%	0.54	4.25	6.00	9t --- 0 out tie	9t 3 out tie
25	791	72	Jun 18(2)	BOS		NYY	W,4-1	9-GF	S(15)	5	1.0	1	0	0	0	2	0	0	3.04	2.96	4	13	11	2	4	1	1	0	0	0		0	0	0	0	0	4	0	0	0	0	0	0	.47	0.037	.32	0.02%	0.54	5.65	9.00	9t --- 0 out a3	9t end a 3
26	792	75	Jun 21	BOS	@	MIN	L,4-5	9-9		2	1.0	0	0	0	0	1	0	0	2.92	2.89	3	9	6	2	1	1	1	0	1	0		0	0	0	0	0	3	0	0	0	0	0	0	1.84	0.141	1.38	0.06%	0.52	4.25	6.00	9b --- 0 out tie	9b 3 out tie
27	793	77	Jun 23	BOS	@	CHW	W,3-1	9-GF	S(16)	1	1.0	0	0	0	0	1	0	0	2.81	2.83	3	9	8	5	0	2	0	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	1.25	0.097	.81	0.04%	0.53	4.25	6.00	9b --- 0 out a2	9b end a 2
28	794	78	Jun 24	BOS	@	CHW	L,4-5	9-GF	L(2-4)	0	0.2	2	1	1	0	1	0	0	3.08	2.76	4	14	10	4	1	2	1	1	0	0		0	0	1	0	0	4	0	0	0	0	0	0	2.35	-0.357	1.81	-0.17%	-0.71	0.30	2.00	9b --- 0 out tie	9b end d 1
29	795	82	Jun 29	BOS		MIA	L,0-2	9-GF		4	1.0	3	1	1	0	1	1	0	3.29	3.18	5	15	9	4	1	1	3	1	1	0		0	0	1	1	0	5	0	0	0	0	0	0	.50	-0.071	.26	-0.02%	-0.46	0.45	3.00	9t --- 0 out d1	9t end d 2
Jul				Tm		Opp	Rslt	Inngs	Dec	DR	IP	H	R	ER	BB	SO	HR	HBP	ERA	FIP	BF	Pit	Str	StL	StS	GB	FB	LD	PU	Unk	GSc	IR	IS	SB	CS	PO	AB	2B	3B	IBB	GDP	SF	ROE	aLI	WPA	acLI	cWPA	RE24	DFS(DK)	DFS(FD)	Entered	Exited
30	796	84	Jul 1	BOS	@	TOR	W,7-6	8-GF	S(17)	1	1.1	3	1	1	0	3	0	0	3.45	2.98	6	22	17	4	4	0	3	2	0	0		2	0	2	0	0	6	1	0	0	0	0	0	3.70	0.215	2.37	0.08%	-0.05	5.20	10.00	8b 12- 2 out a1	9b end a 1
31	797	87	Jul 5	BOS		TEX	W,4-2	9-GF	S(18)	3	1.0	0	0	0	0	0	0	0	3.34	2.99	3	11	8	2	0	1	2	1	1	0		0	0	0	0	0	3	0	0	0	0	0	0	1.02	0.080	.66	0.03%	0.54	2.25	3.00	9t --- 0 out a2	9t end a 2
32	798	91	Jul 9	BOS		OAK	W,4-3	9-GF	S(19)	3	1.0	0	0	0	1	1	0	0	3.23	3.03	3	20	10	2	3	0	1	0	0	0		0	0	0	1	0	2	0	0	0	0	0	0	2.79	0.172	2.28	0.08%	0.54	3.65	6.00	9t --- 0 out a1	9t end a 1
33	799	92	Jul 14	BOS	@	CHC	W,8-3	9-GF	S(20)	4	0.1	0	0	0	0	1	0	0	3.19	2.96	1	3	3	2	1	0	0	0	0	0		3	0	0	0	0	1	0	0	0	0	0	0	.58	0.018	.52	0.01%	0.81	2.75	4.00	9b 123 2 out a5	9b end a 5
34	800	97	Jul 19	BOS	@	OAK	L,5-6	8-GF(8)		4	1.0	0	0	0	1	1	0	0	3.09	3.01	4	19	13	2	3	0	2	0	1	0		0	0	0	0	0	3	0	0	0	0	0	0	.51	0.028	.48	0.02%	0.47	3.65	6.00	8b --- 0 out d1	8b end d 1
35	801	99	Jul 22	BOS		NYM	W,8-6	9-GF	S(21)	2	0.1	1	0	0	0	0	0	0	3.06	3.01	2	8	6	2	0	0	2	1	0	0		1	1	0	0	0	2	0	0	0	0	0	0	.75	0.014	.61	0.01%	-0.66	0.15	1.00	9t -2- 2 out a3	9t end a 2
36	802	102	Jul 26	BOS		ATL	W,5-3	9-GF	S(22)	3	1.0	1	0	0	0	1	0	1	2.97	3.05	4	17	13	1	3	0	2	1	1	0		0	0	0	1	0	3	0	0	0	0	0	0	2.41	0.080	2.33	0.05%	0.54	3.05	6.00	9t --- 0 out a2	9t end a 2
37	803	103	Jul 28	BOS	@	SFG	W,3-2	9-GF	S(23)	1	1.0	0	0	0	0	2	0	0	2.88	2.93	3	9	8	2	3	0	1	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	2.66	0.203	2.66	0.12%	0.51	6.25	9.00	9b --- 0 out a1	9b end a 1
38	804	104	Jul 29	BOS	@	SFG	L,2-3	9-GF	L(2-5)	0	0.0	1	1	1	0	0	1	0	3.15	3.31	1	1	1	0	0	0	1	0	0	0		0	0	0	0	0	1	0	0	0	0	0	0	2.27	-0.361	2.40	-0.23%	-1.00	-2.60	-3.00	9b --- 0 out tie	9b end d 1
Aug				Tm		Opp	Rslt	Inngs	Dec	DR	IP	H	R	ER	BB	SO	HR	HBP	ERA	FIP	BF	Pit	Str	StL	StS	GB	FB	LD	PU	Unk	GSc	IR	IS	SB	CS	PO	AB	2B	3B	IBB	GDP	SF	ROE	aLI	WPA	acLI	cWPA	RE24	DFS(DK)	DFS(FD)	Entered	Exited
39	805	107	Aug 1	BOS	@	SEA	W,6-4	9-GF	S(24)	2	1.0	0	0	0	0	1	0	0	3.06	3.26	3	15	11	3	3	0	2	0	1	0		0	0	0	0	0	3	0	0	0	0	0	0	1.16	0.088	1.13	0.05%	0.49	4.25	6.00	9b --- 0 out a2	9b end a 2
40	806	112	Aug 7	BOS		KCR	W,6-2	9-GF	W(3-5)	5	1.0	0	0	0	0	2	0	0	2.97	3.14	3	13	11	4	0	0	1	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	1.87	0.146	.96	0.05%	0.54	10.25	15.00	9t --- 0 out tie	9t end tie
41	807	114	Aug 9	BOS		KCR	W,4-3	9-GF	S(25)	1	1.0	1	1	1	1	1	1	0	3.13	3.52	4	19	11	3	2	1	1	0	0	0		0	0	0	1	0	3	0	0	0	0	0	0	2.04	0.080	.98	0.02%	-0.46	1.05	3.00	9t --- 0 out a2	9t end a 1
42	808	115	Aug 10	BOS		KCR	W,2-0	9-GF	S(26)	0	1.0	0	0	0	0	2	0	0	3.05	3.41	3	16	11	3	2	0	1	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	1.02	0.080	.53	0.03%	0.54	6.25	9.00	9t --- 0 out a2	9t end a 2
43	809	118	Aug 13	BOS		DET	W,6-3	9-GF	S(27)	2	1.0	1	0	0	0	0	0	0	2.97	3.41	4	12	8	0	2	0	4	1	2	0		0	0	0	0	0	4	0	0	0	0	0	0	.79	0.037	.47	0.01%	0.54	1.65	3.00	9t --- 0 out a3	9t end a 3
44	810	119	Aug 15	BOS	@	WSN	W,5-4	9-GF	S(28)	1	1.0	0	0	0	0	1	0	0	2.90	3.35	3	5	5	1	1	1	1	0	0	0		0	0	0	0	0	3	0	0	0	0	0	0	2.66	0.203	1.78	0.08%	0.51	4.25	6.00	9b --- 0 out a1	9b end a 1
45	811	124	Aug 20	BOS	@	NYY	W,6-5	9-GF	S(29)	4	1.0	1	0	0	0	2	0	1	2.83	3.33	5	16	12	2	3	0	2	0	0	0		0	0	0	0	0	4	1	0	0	0	0	0	5.55	0.207	4.18	0.09%	0.52	5.05	9.00	9b --- 0 out a1	9b end a 1
46	812	127	Aug 23	BOS	@	HOU	W,7-5	9-9		2	0.1	0	0	0	0	0	0	0	2.81	3.33	1	3	1	0	0	0	1	0	0	0		0	0	0	0	0	1	0	0	0	0	0	0	2.27	0.058	1.62	0.03%	0.24	0.75	1.00	9b --- 0 out tie	9b --- 1 out tie
47	813	134	Aug 30	BOS		HOU	L,4-7	8-8		6	1.0	0	0	0	0	1	0	0	2.74	3.28	3	9	7	1	1	1	1	1	0	0		0	0	0	0	0	3	0	0	0	0	0	0	.23	0.018	.10	0.01%	0.54	4.25	6.00	8t --- 0 out d3	8t 3 out d3
Sept				Tm		Opp	Rslt	Inngs	Dec	DR	IP	H	R	ER	BB	SO	HR	HBP	ERA	FIP	BF	Pit	Str	StL	StS	GB	FB	LD	PU	Unk	GSc	IR	IS	SB	CS	PO	AB	2B	3B	IBB	GDP	SF	ROE	aLI	WPA	acLI	cWPA	RE24	DFS(DK)	DFS(FD)	Entered	Exited
48	814	137	Sep 3	BOS	@	KCR	W,7-3	9-GF		3	1.0	3	2	2	0	1	0	0	3.09	3.23	6	21	15	3	2	0	5	1	0	0		0	0	2	0	0	6	1	0	0	0	0	0	.25	0.003	.08	0.00%	-1.48	-1.55	0.00	9b --- 0 out a6	9b end a 4
49	815	138	Sep 4	BOS	@	TBR	W,7-3	9-GF		0	1.0	0	0	0	0	0	0	0	3.02	3.23	3	8	6	0	2	0	3	2	1	0		0	0	0	0	0	3	0	0	0	0	0	0	.24	0.018	.09	0.00%	0.50	2.25	3.00	9b --- 0 out a4	9b end a 4
50	816	139	Sep 5	BOS	@	TBR	L,6-8	11-GF(11)	BL(3-6)	0	0.0	1	3	2	1	0	1	0	3.43	3.59	2	13	7	0	1	0	1	0	0	0		0	0	0	0	0	1	0	0	0	0	0	0	5.23	-0.556	2.61	-0.17%	-2.38	-5.20	-6.00	11b -2- 0 out a1	11b end d 2
51	817	145	Sep 12(2)	BOS		NYY	L,1-4	9-9		6	0.0	1	2	1	1	0	0	0	3.63	3.66	2	12	5	0	1	0	1	1	0	0		0	0	1	0	0	1	0	0	0	0	0	0	.84	-0.098	.06	-0.01%	-1.50	-3.20	-3.00	9t --- 0 out d1	9t -23 0 out d1
							38-13		W-L:3-6,Sv:29,BSv:4	2.3	44.2	40	21	18	17	52	5	2	3.63	3.66	188	721	68%	16%	13%	0.29		23%	17%	0		6	17%	13	4	0	169	9	0	1	0	0	0	1.88	0.314	1.42	-0.02%	3.03	145.10	254.00

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