Fernando Tatis's 159 OPS+ At Age 20 Puts Him In Great Company

Yes, there is still lots of the season to go, but only 8 guys since 1900 had at least a 150 OPS+ age 20 or less with 200+ PAs. 7 are in the top 40 of career offensive WAR. The other is Trout (at 66).

Player	OPS+	PA	Year	Age
Mike Trout	168	639	2012	20
Ty Cobb	167	642	1907	20
Mel Ott	165	675	1929	20
Al Kaline	162	681	1955	20
Mickey Mantle	162	626	1952	20
Alex Rodriguez	161	677	1996	20
Ted Williams	160	675	1939	20
Fernando Tatis Jr.	159	230	2019	20
Rogers Hornsby	151	550	1916	20

Lowering it to 140 OPS+ gives us

Player	OPS+	PA	Year	Age
Mike Trout	168	639	2012	20
Ty Cobb	167	642	1907	20
Mel Ott	165	675	1929	20
Al Kaline	162	681	1955	20
Mickey Mantle	162	626	1952	20
Alex Rodriguez	161	677	1996	20
Ted Williams	160	675	1939	20
Fernando Tatis Jr.	159	230	2019	20
Rogers Hornsby	151	550	1916	20
Jimmie Foxx	148	473	1928	20
Ronald Acuna Jr.	144	487	2018	20
Juan Soto	143	338	2019	20
Juan Soto	143	494	2018	19
Frank Robinson	143	667	1956	20
Dick Hoblitzell	143	590	1909	20

Here all the guys with a .900 or higher OPS (not adjusted in any way) at age 20 or less with 200+ PAs in the first half since 1908 (from Baseball Reference Play Index)

Player	Year	OPS	PA
Mel Ott	1929	1.139	376
Al Kaline	1955	1.067	378
Fernando Tatis Jr.	2019	1.013	234
Alex Rodriguez	1996	0.996	322
Frank Robinson	1956	0.991	310
Ted Williams	1939	0.987	301
Mike Trout	2012	0.959	290
Juan Soto	2019	0.943	342
Mickey Mantle	1952	0.934	275
Juan Soto	2018	0.929	209
Ken Griffey Jr.	1990	0.907	361