As anyone familiar with sabermetrics knows, one can evaluate batting events by means of linear weights. What this means is that a single is worth about two-fifths of a run while a home run, because it can drive in the men on base, is worth over three times a single. Research has revealed that types of batted balls can assign similar values. Line drives are worth a lot, while infield flies are almost as good as strike outs. There is a problem in deciding what category to place a batted ball sometimes, especially the difference between a fly ball and a liner, as symbolised by the neologism 'fliner'. So one needs to treat these numbers with a degree of circumspection.
What this chart shows is the difference between a batted-ball linear weight and Fangraphs' wRC. wRC gives a supposed aggregate number of runs that should have been scored based on hitting events. Some people have flares falling in, while others hit the ball hard, but see it caught. The batted ball number also includes Ultimate Base Running, to make it more compatible with wRC. Note that the chart excludes pitchers' hitting. The first column is wRC, the second the batted ball expected runs.
Ian Desmond 42 33 + 9 Adam LaRoche 49 43 + 6 Danny Espinosa 22 20 + 2 Zach Walters 4 3 + 1 Anthony Rendon 56 56 0 Ryan Zimmerman 24 24 0 Bryce Harper 12 12 0 Wilson Ramos 19 20 - 1 Tyler Moore 8 9 - 1 Scott Hairston 4 5 - 1 Steven Souza 0 1 - 1 Jayson Werth 53 55 - 2 Greg Dobbs 1 3 - 2 Jose Lobaton 11 14 - 3 Nate McLouth 11 15 - 4 Sandy Leon 2 6 - 4 Kevin Frandsen 12 20 - 8 Denard Span 40 58 -18Poor Denard Span. He has been poorly rewarded for his efforts at the plate. I don't think any other hitter is wildly out of line with his results, but I do note that Danny Espinosa, whose .214/.282/.343 slash line isn't all that impressive to begin with, has been hitting a little bit above expectations.