Mookie Betts is 1 of 27 players in MLB history have a WAR ≥ 39.0 thru their 26 YO season

RANK	PLAYER	TEAM	WAR/pos	AB	HR	RBI	SB	BA	OBP	SLG	OPS
1	Mike Trout	LAA	64.2	3,870	240	648	189	0.307	0.416	0.573	0.990
2	Ty Cobb	DET	63.4	4,348	47	758	453	0.368	0.419	0.515	0.934
3	Mickey Mantle	NYY	61.4	3,937	249	766	77	0.314	0.430	0.577	1.006
4	Rogers Hornsby	STL	56.9	3,807	99	638	101	0.348	0.408	0.536	0.944
5	Alex Rodriguez	SEA-TEX	55.2	4,382	298	872	160	0.309	0.380	0.579	0.958
6	Jimmie Foxx	PHA	54.2	3,862	266	960	42	0.338	0.437	0.640	1.077
7	Mel Ott	NYG	51.3	4,542	242	960	45	0.317	0.411	0.554	0.966
8	Ken Griffey Jr.	SEA	50.0	3,985	238	725	108	0.302	0.381	0.549	0.930
9	Tris Speaker	BOS	48.7	3,388	39	473	238	0.340	0.413	0.494	0.907
10	Arky Vaughan	PIT	48.0	3,705	65	569	54	0.332	0.425	0.484	0.909
11	Hank Aaron	MLN	46.6	4,114	219	743	36	0.318	0.369	0.560	0.929
12	Frank Robinson	CIN	46.2	3,895	241	709	99	0.309	0.390	0.571	0.961
13	Albert Pujols	STL	46.1	3,489	250	758	36	0.332	0.419	0.629	1.047
14	Eddie Collins	PHA	45.9	3,090	13	389	309	0.337	0.415	0.438	0.852
15	Eddie Mathews	BSN-MLN	45.5	3,752	253	663	34	0.277	0.382	0.541	0.923
16	Al Kaline	DET	44.5	4,505	159	694	84	0.309	0.374	0.485	0.859
17	Rickey Henderson	OAK-NYY	44.1	3,463	75	343	573	0.295	0.403	0.425	0.828
18	Babe Ruth	BOS-NYY	44.0	2,108	162	527	44	0.341	0.467	0.700	1.167
19	Johnny Bench	CIN	43.3	4,065	212	745	29	0.270	0.340	0.483	0.823
20	Joe DiMaggio	NYY	42.6	3,368	198	816	21	0.345	0.408	0.626	1.034
21	Andruw Jones	ATL	42.5	4,115	221	675	118	0.269	0.341	0.494	0.836
22	Barry Bonds	PIT	41.3	3,111	142	453	212	0.269	0.367	0.485	0.852
23	Willie Mays	NYG	40.8	2,899	187	509	121	0.311	0.387	0.593	0.980
24	Vada Pinson	CIN	40.3	4,568	147	624	160	0.302	0.349	0.485	0.834
25	Cesar Cedeno	HOU	40.0	4,265	135	594	374	0.292	0.350	0.466	0.817
26	Mookie Betts	BOS	39.3	2,992	125	437	122	0.300	0.374	0.514	0.887
26	Lou Gehrig	NYY	39.3	2,746	146	635	30	0.335	0.436	0.622	1.058