Scouting grades: Hit: 50 | Power: 50 | Run: 60 | Arm: 55 | Field: 55 | Overall: 50
A bargain signing for $20,000 out of the Dominican Republic in 2011, Hernandez swiftly established himself as one of the best all-around athletes in the Astros' system. His prospect stock took a huge hit after he hit .219/.275/.362 in Double-A in '15, but he made adjustments last year, batting .307/.377/.459 in the upper Minors and making his big league debut. He homered three times in his first nine starts for Houston before cooling off down the stretch.
Hernandez sparked his turnaround by toning down an overly aggressive approach and improving his ability to recognize pitches. While he can make further improvements in both regards, he's doing a better job of making consistent contact (cutting his strikeout rate from 25 percent in '15 to 18 percent last year) and tapping into his solid raw power from the right side of the plate. He has started to wait for pitches to drive, and he draws a decent amount of walks rather than getting himself out with impatience.
Hernandez has plus speed and knows how to use it on the bases, making him a potential 20-20 threat. His quickness doesn't play as well in the outfield, where his instincts remain somewhat raw. He's a competent center fielder and more of an asset in right field, where he has a strong arm and saw most of his action in 2016.