The new Ping i210 (the compact, cavity back players iron) and i500 (a fast-faced players distance iron) reveal that iron technology for today’s better players adroitly balances two pressing characteristics: precision and power.
The rough at Erin Hills seems to look nastier than it seems to be playing, and that would seem to violate one of the USGA’s long-held US Open tenets for the infamous “cost of rough” penalty.