10. Mac Williamson
This former pitcher is as close to a five-tool player as the Giants have, which is not to say that he is one. The Giants simply don't have that guy in their system, yet. He showed power, average, and outfield speed in 2013 with San Jose before Tommy John surgery stripped him of a follow-up year in Richmond or higher. Though he doesn't use it often, his speed on the base paths has looked similar to Hunter Pence. Williamson had 15 outfield assists in 2013, so clearly his arm is at least accurate. That number has tailed off since the elbow reconstruction, but still is regarded as having one of, if not the best arms in terms of strength in the system. Makes sense, right? Pitchers usually have cannons. Williamson is great at working counts, draws walks often, and drives the ball to all parts of the yard.
11. Adalberto Mejia
Adalberto Mejia is still just 22-years-old, and that is one of many upsides to this hard-throwing lefty. He has dealt with multiple injury issues, including nagging blisters on his throwing hand, during a grinding 2014 season. Then he missed the first 50 games of 2015 after testing positive for a banned substance used for weight loss. Still, Mejia rebounded with a positive end to last year. He has late tail, and sink, with his low-to-mid 90s fastball and fools hitters on a regular basis with a plus changeup that features beautiful fade. His breaking pitches, slider and curveball, will need to improve for Mejia to reach his full potential. In terms of his weight, which had noticeably increased since 2013, looks to have been quelled in time for the start of the new season.
12. Ray Black
Raymond Black throws a baseball 100 miles per hour. That statement doesn't turn heads quite the way it used to (thanks Aroldis), but it's still awesome. You may not have heard of Black because complications from shoulder surgery set this 2011 draftee back a few years. 2014, remarkably enough, was his first professional season. And he threw straight cheese. In 35.1 innings, mostly spent as an Augusta GreenJackets reliever, Black kept his WHIP below one and struck out 71 batters. He was my dark horse for a September call-up in 2015, but is now on the 40-man roster to begin the 2016 season, which he'll spend with in Richmond. He continues to strike out hitters at a crazy high rate, entering the new season averaging between 17 and 18 punch outs per nine innings. With the type of fastball/slider combination Black owns, command will always be his number one deal breaker.