Play 85 · Track 07 · Know the game · 8 min
Tell the era from the racquet.
Then say what it did to the swing.
Wood to graphite, gut to polyester — and how each leap rewired technique. Borg swung up on wood; poly let the whole tour follow him.
01
Five frames drawn to scale, and the swing each one allowed
02
Why a string, not a racquet, built the modern game
03
The physics of head width, stiffness, tension and snapback, sourced
04
A reading task: date a racquet from a photograph within a decade
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