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Traditional stats like wins, losses and ERA are vital in fantasy judgement. However, some pitchers require a deeper look into their performance. This is where graphs and a bit of sabermetrics come into play.
The site FanGraphs.com offers a wealthy database of diagrams of players' statistics and how they compare to the rest of the league.
There are also more new-fangled statistics to go by.
Each player has a specific WAR (wins above replacement). In other words, how many wins they contribute to the team as opposed to an average MLB player in his place.
It's no surprise that names like Justin Verlander, Felix Hernandez, Johnny Cueto and Gio Gonzalez atop the WAR leaderboards for pitchers.
xFIP is a more in-depth way of measuring a pitcher's ERA. This is one of the best tools to predict a pitcher's future performance, as it takes into account a pitcher's home run and fly-ball percentages, while considering timing and performance on balls in play.
You can find the xFIP leaders here, and you'll find some names you might not have expected, like Joe Blanton and Jon Niese to name a few. If you're part of a keeper league, you would be remiss not to heavily consider a pitcher's xFIP before setting those keepers.