When I saw Kevin Keyes play for the Lake Monsters (formerly the Nationals NYPL affiliate), there was one word that came to mind: POWER. It's not the only tool he features, but it is the most prominent.
Keyes in a big strong 6'3 235-245 right-handed hitting outfielder out of the University of Texas. He was drafted by the Nationals in the 2010 Draft and was assigned to Vermont in time for the start of last year's New York Penn League Season.
As I mentioned previously, Keyes' best and most noticeable tool is his power, which he has a lot of. He also has a good hit tool in which he hits the ball the opposite way quite often and has pull power. He hits the fastball real well but doesn't fare too well against off-speed pitches. He has good pitch recognition but when he decides to swing he more often than not chases. That happens with change-ups more than curveballs and sliders. He has solid plate coverage though and he can hit both right-handers and left-handers -- He just needs more plate discipline.
Due to lack of speed and athleticism, he's probably best suited as a first baseman in the long run. He's not terrible on the bases, but lacks range and doesn't get good jumps on balls hit to him. His arm strength is above average but it's probably best to make the positional switch while the Nationals still have time.
Weight is a concern but he's currently stronger than most prospects you'll find and the power is the biggest factor. He hits balls really hard and the power seems while raw, developed for someone of his age and early stage. While he's slated to start the year in Auburn with the Doubledays, he's likely to make his way out before the year is over and possibly get some at-bats in Hagerstown. That's obviously the Nationals hope but regardless, there's absolutely no rush and while he might be a project, he's closer to the Majors than one would think. Some comparison's in the past have been Chris Carter, in which is a fine ceiling to reach, it would be nice however if Keyes fared out better than Carter.