Originally Posted by dougdirt
Getting full seasons from Simmons and Medlen will certainly help. I also expect Justin Upton and Jason Heyward to improve over what they did in 2012 as well. That infield defense outside of Simmons though is a big cause for concern IMO.
Good point about Simmons and Medlen. Regarding Heyward, I could see some offensive improvement, but I don't know how real last year's 21.5 UZR year was. If his defense is more in line with 2010 and 2011, it seems like his overall contribution might be about the same as last year. I'll be interested to see what ZIPS projects for him.