Brutal Oakmont is considered the toughest of all US Open venues for its thick rough, sloping fairways and marble-top greens that make Augusta’s look tame by comparison. The greens are so fast, in fact, that the stimpmeter was developed by Edward Stimpson shortly after attending the 1935 US Open there. There’s perhaps no better examination in the game for Irish golf’s two superstars, Rory McIlroy and Shane Lowry, as they arrive in ‘Steel City’ at the peak of their golfing maturity.