Errors are not the only thing for fielding, but they've only committed 2 errors in 23 games. Averaged over 162 games comes out to 14.1 errors. That's pretty darn good. STL had 4 but only 10 games. PHI is next with 7 in 17 games and HOU also with 7 in 22 games. My eyes also tell me that the defense has been really good overall, maybe ever great. Making the plays that need to be made and the occasional extra effort play, like the DP Arraez barehanded the throw and turned on, have been key.