It's too way to early in the season to put a lot of weight into minor league numbers, but it's never to early to at least give them a look. I prefer wOBA to OPS, but it was easier for me to gather this data by OPS. Links lead to sources with scouting information (mostly video and scouting).
OPS Leaders (A+/A)
1. Bryce Harper WAS, 1.132 (18, A, RF/CF) (eBay)
2. Oswaldo Arcia MIN, 1.124 (19, A, DH) (eBay)
3. Hak-Ju Lee CHC, 1.109 (20, A+, SS) (eBay)
4. Jose Altuve HOU, 1.093 (20, A+, 2B) (eBay)
5. Brandon Jacobs BOS, 1.066 (20, A, LF) (eBay)
6. Manny Machado BAL, 1.057 (18, A, SS) (eBay)
7. Rey Navarro KC, 1.019 (21, A+, 2B) (eBay)
8. Slade Heathcott NYY, 1.011 (20, A, CF) (eBay)
9. Jarek Cunningham PIT, 1.007 (21, A+, 2B) (eBay)
10. Derek Dietrich TB, 1.002 (21, A, SS) (eBay)
* Minimum 60 PA; Maximum age A+ (21), A (20)
OPS Leaders (AAA/AA)
1. Paul Goldschmidt ARI, 1.232 (23, AA, 1B) (eBay)
2. James Darnell SD, 1.219 (24, AA, 3B) (eBay)
3. Anthony Rizzo SD, 1.143 (21, AAA, 1B) (eBay)
4. Jaff Decker SD, 1.142 (21, AA, LF) (eBay)
5. Blake Tekotte SD, 1.137 (23, AA, CF) (eBay)
6. Scott Van Slyke LAD, 1.129 (24, AA, 1B) (eBay)
7. Ryan Mount LAA, 1.124 (24, AA, 2B) (eBay)
8. Cody Puckett CIN, 1.084 (24, AA, 2B) (eBay)
9. Collin Cowgill ARI, 1.084 (24, AAA, CF) (eBay)
10. Alex Hassan BOS, 1.083 (23, AA, LF) (eBay)
* Minimum 60 PA; Maximum age AAA (25), AA (24)
Strikeout Leaders (A+/A)
1. Shelby Miller STL, 42 (20, A+, RHP) (eBay)
2. Tyler Skaggs ARI, 40 (19, A+, LHP) (eBay)
3. Daniel Renken CIN, 38 (21, A, RHP) (eBay)
4. Manuel Rivera BOS, 36 (21, A, LHP) (eBay)
5. Carlos Perez ATL, 34 (19, A, LHP) (eBay)
6. Drew Pomeranz CLE, 34 (22, A+, LHP) (eBay)
7. Andre Rienzo CHW, 33 (22, A+, RHP) (eBay)
8. Kevius Sampson SD, 33 (20, A, RHP) (eBay)
9. Robbie Erlin TEX, 32 (20, A+, LHP) (eBay)
10. Ethan Martin LAD, 32 (21, A+, RHP) (eBay)
* Maximum age A+ (22), A (21)
Strikeout Leaders (AAA/AA)
1. Eric Surkamp SF, 41 (23, AA, LHP) (eBay)
2. Juan Nicasio COL, 40 (24, AA, RHP) (eBay)
3. Neal Ramirez TEX, 34 (21, AAA, RHP) (eBay)
4. Charlie Furbush DET, 33 (25, AAA, LHP) (eBay)
5. Alexander Torres TB, 33 (23, AAA, LHP) (eBay)
6. Kelvin De La Cruz CLE, 32 (23, AA, LHP) (eBay)
7. Matt Moore TB, 32 (21, AA, LHP) (eBay)
8. Robert Whitenack CHC, 32 (22, AA, RHP) (eBay)
9. Scott Barnes CLE, 31 (23, AAA, LHP) (eBay)
10. Andy Oliver DET, 31 (23, AAA, LHP) (eBay)
* Maximum age AAA (25), AA (24)
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