I've added four defensive metrics to this table. Below are their descriptions -- the first three from baseball-reference.com, and UZR from FanGraphs:
- Defensive Efficiency: Percentage of balls in play converted into outs. This is an estimate based on team defensive and pitching stats.
- Total Zone Fielding Runs Above Average: The number of runs above or below average the player/team was worth, based on the number of plays made.
- Defensive Runs Saved Above Average: The number of runs above or below average the player/team worth, based on the number of plays made. Also known as the Dewan Plus/Minus system.
- Ultimate Zone Rating: the number of runs above or below average the player/team is worth, by comparing them to the league average in how often they convert balls hit to their zones into outs. The number shown here is actually the more comprehensive "Fld" number in FG, which combines UZR and a catcher rating, since catchers aren't included in UZR. Good description of UZR here.
Maybe it's because the sample size is small, but the Phillies' numbers are quite different across the four methods to this point, ranking as high as 3rd in Total Zone, and as low as 14th in UZR. The four should not be viewed as being equally valid. UZR and DRS are probably the most accurate, but all of these, including UZR and DRS, would presumably be subject to small-sample noise after only a quarter of the season.