This was not an easy pick for me, as I considered Carl Crawford, Evan Longoria, Mark Teixeira and Mark Reynolds, but I couldn't get away from the upside of J-Up-Justin Upton.
Upton went 26-86-20-.300-..366-.532-.899 in 2009 while watching his K% drop from 34% in 2008 to 26% in 2009. His HR/FB% increased from 15.3% in 2008 to 18.8% in 2009 which coincided with a drop in his FB% from 41.9% in 2008 to 35.7% in 2009. Upton also increased his ISO, or isolated power, from .213 in 2008 to .232 in 2009. Should he be able to maintain his HR/FB% while increasing his FB%, he could easily hit 30 HRs in 2010. I think he can do better than that actually.
Upton not only provided fantasy owners with solid power, but he also contributed 20 SBs in 2009 after stealing only 1 bag in 2008. I think the speed is here to stay as the Diamondbacks struggled to score runs in 2009, and I think that trend continues in 2010. I expect Upton to steal between 20-25 bags in 2010.
Upton is capable of a 30-100-20-.300 season in 2010, and should be drafted accordingly.