White Sox shortstop Alexei Ramirez is ranked as the major league’s best defensive shortstop. This is according to his ultimate zone rating. This measures the amount of runs above or below average that a fielder is. This includes error runs (the number of runs given up do to errors as compared to the average fielder) and range runs (which determines efficiency based upon the number of balls hit in his vicinity).
This is a testament to how far Alexei Ramirez has come and how big of an influence the 43 yr old Omar Vizquel has had.