Re: Tyler Washington
Washington, Rachal and Cory Thompson could all be darkhorses that are that much more interesting given the dearth of middle infield prospects in the system. All three are high school players drafted after the first couple rounds that have done nothing but perform in Rookie Leagues (granted Thompson's sample size is less than two weeks at this point).
Regardless, all three are definitely guys to keep an eye on - Washington and Thompson especially.
Despite being a couple years older as he was drafted out of college, Zack Vincej could be a guy to monitor as well.