Originally Posted by onehandbh
If the snap-back of the strings contributes to spin, then why
does Fed use string savers to prevent string movement?
He also changes racquets (to ones with fresh string jobs) fairly
frequently in a match.
Because Fed does not need additional spin help from the string like 3.5 and 4.0 players where this frame will be sold in masses. Fed creates spin with form, like all pros. He could create spin with a a solid paddle, while the rest of us club players could your some help. The technology and idea is not for the pros, that is clearly not the intention from Wilson here.