The reigning US Open champion, Brooks Koepka, was using the JPX900 Tour Irons.
World No18, Paul Casey, was using a combo set of MP25 & MP5 Irons.
Ross Fisher was using a set of JPX900 Tour Irons.
PGA Tour player, Jhonattan Vegas was using the new MP18 MB Irons.
Dyland Frittelli was using a combo set of JPX900 Tour Irons & JPX900 Forged Irons.
Mark Foster was using a combo set of the new MP18 MMC Irons & MMC Fli-Hi long irons.
Chris Wood was using a combo set of MP25 & MP5 Irons.
Former Open Champion, Todd Hamilton, was using a set of MP68 Irons.
Rob Brooks @golfnation_