The .796 is what they got out of that position for the entire season, regardless of who was playing there. However, after Rizzo was called up, he started 86 of the remaining 89 games. Barring injury or a complete collapse in his performance, I think you can pencil him in for at least 150 games. Therefore, an .850 OPS (if he's able to reach that) would make for a nice improvement over last year's production at the position. No you are comparing 2 different stat lines. you are comparing the stat line for every player at first base from last year with only the games played by the starting first basemen this year. A bad 50 at bats by the sub would drop the overall ops by a lot. I know what I'm comparing. I spelled it out pretty clearly. The reason I'm comparing 2013 Rizzo to the overall 2012 stat line for Cubs first basemen is due to my belief that Rizzo will get about 95% of the playing time at first base. I'm too lazy to do the math right now, but I would imagine it would take a disastrous 40 or so plate appearances by the player(s) getting the remaining ~5% of playing time to drag down the .850 OPS too much. I'm in no way predicting an .850 OPS from Rizzo, but I'd like to think that a player of his age with his abilities should show some improvement in 2013. Also, considering how rarely Castro and Barney got a day off (Castro never did), I'm betting that Rizzo is going to be run out there pretty much every day. Jersey's concerns about how poorly Rizzo hit left-handers in 2012 is valid and would be magnified during the course of an entire season. However, I thought (and someone please correct me if I'm wrong) that Rizzo hit lefties pretty well in the minors. If he can improve his numbers against southpaws in 2013 even just a little, that would help.