FANGRAPHS - Minor League Hitter Leaders

MLE Leaderboard: All Minor-League Hitters by wOBA
Below are the top-20 minor-league batters by translated wOBA, according to Steamer (min. 50 PA).

#	Name	Age	Org	Lev	POS	PA	AVG	OBP	SLG	BABIP	wOBA
1	Kyle Roller	26	Yankees	AA	1B	73	.376	.428	.768	.426	.493
2	Gabriel Noriega	23	Mariners	AAA	SS	55	.435	.435	.580	.490	.442
3	Cole Gillespie	30	Mariners	AAA	OF	68	.320	.395	.617	.327	.432
4	J.D. Martinez	26	Tigers	AAA	OF	71	.262	.303	.692	.230	.415
5	George Springer	24	Astros	AAA	OF	61	.314	.397	.563	.410	.413
6	Joey Butler	28	Cardinals	AAA	OF	88	.352	.446	.489	.417	.407
7	Ernesto Mejia	28	Braves	AAA	1B	88	.316	.366	.584	.390	.407
8	Gregory Polanco	22	Pirates	AAA	OF	118	.354	.399	.536	.422	.401
9	Eugenio Velez	32	Brewers	AAA	OF	91	.353	.405	.498	.406	.396
10	Donald Lutz	25	Reds	AA	OF	82	.324	.362	.573	.369	.395
11	Tyler Ladendorf	26	Athletics	AAA	SS	97	.342	.421	.455	.418	.387
12	Allan Dykstra	27	Mets	AAA	1B	95	.276	.402	.481	.339	.386
13	Audry Perez	25	Cardinals	AAA	C	54	.348	.367	.512	.393	.383
14	Taylor Teagarden	30	Mets	AAA	C	63	.257	.336	.547	.313	.381
15	Mookie Betts	21	Red Sox	AA	2B	120	.338	.380	.496	.353	.380
16	Chris Taylor	23	Mariners	AAA	SS	119	.336	.360	.518	.392	.375
17	Johnny Giavotella	26	Royals	AAA	2B	82	.345	.381	.472	.358	.374
18	Micah Johnson	23	White Sox	AA	2B	128	.336	.395	.454	.403	.373
19	Wade Hinkle	24	Angels	A+	1B	57	.326	.374	.483	.479	.371
20	Shawn Zarraga	25	Brewers	AA	C	69	.387	.432	.428	.425	.370

http://www.fangraphs.com/blogs/minor-league-batting-leaders-according-to-steamer-mles/