The American is using a graphite-shafted long iron at Merion
Strongly-fancied Rickie Fowler is the latest player to be spotted using a 2-iron at Merion.
The World No 32 has been pictured teeing off in the US Open with a Cobra AMP Forged iron featuring 19˚ of loft and a Matrix Ozik HM2 tipped extra-stiff shaft.