Cano, Weeks, Ellis, and Polanco NAME E DP RF ZR Mark Ellis, Oak 4 88 5.02 .868 Placido Polanco, Det 8 100 5.22 .833 Brian Roberts, Bal 8 110 4.98 .829 Rickie Weeks, Mil 15 84 5.02 .815 Robinson Cano, NYY 13 103 5.15 .810 This is ranked by zone rating. Weeks is 9th, Ellis 1st, Polanco 5th, Roberts 6th, and Cano is 10th. Ranked by range factor Polanco 3rd, Cano 6th, Weeks 9th, Ellis 10th, and Roberts 12th. So you do lose some defense with Roberts and you gain defensively with Polanco and Ellis and it is a wash with Cano. This is based on trading Weeks for any one of these players either through trade or free agency. This year Orlando Hudson had a RF of 4.82 and a ZR of .790. That is well below the numbers that Weeks put up this year.