| Spec | Wilson Defyer 98 Pro | Wilson Ultra 99 Pro |
|---|---|---|
| Weight (unstrung) | 305g | 305g |
| Head Size | 98 sq in | 99 sq in |
| Balance | Head Light | Head Light |
| String Pattern | 16x20 | 16x18 |
| Swingweight | 319 | 330 |
| RA Stiffness | 64 | 71 |
| Strung Weight | 323g | 330g |
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