Babe Ruth, the pitcher, pinch hit in his first World Series appearance.

Here are some interesting facts about and surrounding Babe Ruth from early in his career as a starting pitcher for the Boston Red Sox.

Babe Ruth pitching in 1916 allowed ZERO home runs in 323 innings. Davis and Herrera in 2014: zero HR. Friday, March 11, 2016

Babe Ruth led the American League in 1916:
ERA 1.75
Starts 40
Shutouts 9
ERA+ 159
H9 6.4
HR9 0 (that's how I noticed) ...

Pitching for the Red Sox the Babe did, however, allow an inside the park home run in the first inning of game two of the 1916 World Series to center fielder Hi Meyers of the Brooklyn Dodgers in Braves Field in Boston before 47,373 fans. Ruth went all the way and won 2-1 in 14 innings ...
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Boston Red Sox pitcher Babe Ruth
Cominsky Park, Chicago 1914
commons.wikimedia.org

Born: February 6, 1895 in Baltimore, MD
High School: St. Mary's HS (Baltimore, MD)
Debut: July 11, 1914 Age 19

Ruth pitched 23 innings in four games in 1914 at age 19. The Red Sox were 91-62 for manager Bill Carrigan but finished second.

In 1915 Carrigan's Red Sox won the first of two consecutive American League pennants. The starting pitchers:

Rk	Pos	Name	Age	W	L	W-L%	ERA	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	ERA+	FIP	WHIP	H9	HR9	BB9	SO9	SO/W
1	SP	Rube Foster	27	19	8	.704	2.11	37	33	2	21	5	1	255.1	217	83	60	3	86		82	10	1	5	1010	132	3.05	1.187	7.6	0.1	3.0	2.9	0.95
2	SP	Ernie Shore	24	19	8	.704	1.64	38	32	3	17	4	0	247.0	207	75	45	3	66		102	4	1	4	978	170	2.59	1.105	7.5	0.1	2.4	3.7	1.55
3	SP	Babe Ruth*	20	18	8	.692	2.44	32	28	3	16	1	0	217.2	166	80	59	3	85		112	6	1	9	874	114	2.81	1.153	6.9	0.1	3.5	4.6	1.32
4	SP	Dutch Leonard*	23	15	7	.682	2.36	32	21	7	10	2	0	183.1	130	57	48	3	67		116	14	1	2	705	119	2.68	1.075	6.4	0.1	3.3	5.7	1.73
5	SP	Smoky Joe Wood	25	15	5	.750	1.49	25	16	8	10	3	2	157.1	120	32	26	1	44		63	1	0	3	600	188	2.55	1.042	6.9	0.1	2.5	3.6	1.43

Ruth played no position other than pitching. The Red Sox won the 1915 World Series over the Philadelphia Phillies 4-1. The Red Sox used three pitchers.

		Playoff Series Stats												Regular Season Stats
Name	G	GS	ERA	W	L	SV	CG	IP	H	R	ER	BB	SO	WHIP	G	GS	ERA	W	L	SV	IP	H	BB	SO	WHIP
Rube Foster	2	2	2.00	2	0	0	2	18.0	12	5	4	2	13	0.778	37	33	2.11	19	8	1	255.1	217	86	82	1.187
Dutch Leonard	1	1	1.00	1	0	0	1	9.0	3	1	1	0	6	0.333	32	21	2.36	15	7	0	183.1	130	67	116	1.075
Ernie Shore	2	2	2.12	1	1	0	2	17.0	12	4	4	8	6	1.176	38	32	1.64	19	8	0	247.0	207	66	102	1.105
Totals	5	5	1.84	4	1	0	5	44.0	27	10	9	10	25	0.841	155	155	2.390	101	50		1397.0	1164	446	634	1.152

They pitched complete games in this order: Shore (L), Foster, Leonard, Shore, Foster.

Game one
Friday, October 8, 1915, Baker Bowl
Attendance: 19,343, Time of Game: 1:58
Phillies 3, Red Sox 1

Top of the 9th, Red Sox Batting, Behind 1-3, Phillies' Pete Alexander facing 7-8-9
one out, one on
Babe Ruth pinch hits for Ernie Shore (P) batting 9th
Groundout: 1B unassisted; Henriksen to 2B

Presumably, had the Red Sox tied the game such as on a dramatic home run by Ruth he would have stayed in the game and pitched the tenth inning. That ground out was the only appearance by the 20 year old starting pitcher.

But why have Ruth pinch hit? Not that they tracked such things but in 1915 Ruth had OPS+ 188, i.e., 88% above league average. And in 92 at bats (AB) Ruth had hit four home runs, tied with six others for ninth most; Braggo Roth led the AL with 7. Roth hit three (2 IPHR) for the White Sox and four for the Indians (one off Shore), all on the road.

In 1918, Boston's last World Series winning year until 2004, Ruth started 19 games as a pitcher: 166 innings, 13-7, 2.22 ERA. But that season Ruth played more as a non-pitcher and tied with Tillie Walker of the Philadelphia As for most home runs with 11 in 317 AB; Walker in 414 AB had one homer that bounced over the fence under the old rule that prevailed through 1930. Ruth never had a bouncing home run in his career. Ruth's home run log through 1918:

1915 HRs	#car	#yr	#gm	Date	@Bat			Pitcher	Score	Inn	Out	RoB	RBI	BOP	Pos	WPA	bWE	Notes	Play Description
1	1	1	1	1915-05-06	BOS	@	NYY	Jack Warhop		t 3	0	---	1	9	1
2	2	2	1	1915-06-02	BOS	@	NYY	Jack Warhop		t 2	2	---	2	9	1
3	3	3	1	1915-06-25	BOS		NYY	Ray Caldwell		b 2		---	3		1
4	4	4	1	1915-07-21	BOS	@	SLB	Bill James		t 3		---	1		1
1916 HRs	#car	#yr	#gm	Date	@Bat			Pitcher	Score	Inn	Out	RoB	RBI	BOP	Pos	WPA	bWE	Notes	Play Description
5	5	1	1	1916-06-09	BOS	@	DET	Jean Dubuc		t 3		---	1		1
6	6	2	1	1916-06-12	BOS	@	SLB	Jim Park		t 7	2	---	3		PH
7	7	3	1	1916-06-13	BOS	@	SLB	Dave Davenport		t 3		---	1		1
1917 HRs	#car	#yr	#gm	Date	@Bat			Pitcher	Score	Inn	Out	RoB	RBI	BOP	Pos	WPA	bWE	Notes	Play Description
8	8	1	1	1917-08-10 (1)	BOS		DET	Bill James		b 5		---	1		1
9	9	2	1	1917-09-15	BOS	@	NYY	Ed Monroe		t 9		---	2	9	1
1918 HRs	#car	#yr	#gm	Date	@Bat			Pitcher	Score	Inn	Out	RoB	RBI	BOP	Pos	WPA	bWE	Notes	Play Description
10	10	1	1	1918-05-04	BOS	@	NYY	Allen Russell	behind 1-4	t 7		---	2	9	1
11	11	2	1	1918-05-06	BOS	@	NYY	George Mogridge		t 4		---	2	6	3
12	12	3	1	1918-05-07	BOS	@	WSH	Walter Johnson		t 6		---	2	4	3
13	13	4	1	1918-06-02	BOS	@	DET	Eric Erickson	behind 0-4	t 6		---	1	9	1
14	14	5	1	1918-06-03	BOS	@	DET	Hooks Dauss		t 1		---	1		8
15	15	6	1	1918-06-04	BOS	@	DET	Bill James		t 6		---	2	3	8
16	16	7	1	1918-06-05	BOS	@	CLE	Johnny Enzmann		t 6		---	2	3	8
17	17	8	1	1918-06-15	BOS	@	SLB	Tom Rogers		t 7	2	---	3	4	7
18	18	9	1	1918-06-25	BOS	@	NYY	Allen Russell		t 1	2	---	2	4	8
19	19	10	1	1918-06-28	BOS	@	WSH	Harry Harper		t 7		---	1	4	8
20	20	11	1	1918-06-30	BOS	@	WSH	Walter Johnson		t 10	2	---	2	3	8

All eleven in 1918 were on the road. In 1919, Ruth's last with the Red Sox, he set a new season home run record with 29, 20 on the road.

Babe Ruth pinch hit for pitcher Ernie Shore in that 1915 WS opening game. They had been teammates on the minor league Baltimore Orioles and then were "sold" to the Red Sox in 1914. They combined for a no-hitter for which Shore was ultimately credited. Ruth walked the first batter and was ejected for arguing. Shore relieved, the runner was thrown out trying to steal and Shore retired 26 on his own.

Saturday, June 23, 1917, Fenway Park
Attendance: 16,158, Time of Game: 1:40
First game of doubleheader
Red Sox 4, Senators 0

Pitching	IP	H	R	ER	BB	SO	HR	ERA	BF	GSc
Babe Ruth	0	0	0	0	1	0	0	2.35	1	49
Ernie Shore, W (7-4)	9	0	0	0	0	2	0	1.76	26
Team Totals	9	0	0	0	1	2	0	0.00	27	49

Data from baseball-reference.com