WILSON Hyper Hammer 6.2 OS Stretch 110 Tennis Racquet Racket 4 3/8” | eBay
Darren Cahill on X: "Federer's frame set-up. 16 gauge gut is 130mm. 17 gauge Alu-Power Rough is 125mm. Pre-stretch on the gut is probably 10% (5% an option) https://t.co/NslwVHoWWd" / X