Jack Nicklaus won two U.S. Opens on Baltusrol's Lower Course, setting a tournament record each time. Phil Mickelson and Jimmy Walker won PGAs on it. But the Lower's most historic event was the ace by architect Robert Trent Jones in 1954 on the par-3 fourth, instantly squelching complaints of critical club members who felt Trent's redesign made it too hard. Trent's younger son, Rees, an avowed A.W. Tillinghast fan, lightly retouched the Lower's design for the 2016 PGA Championship. But there has been another changing of the guard at Baltusrol, as architect Gil Hanse and his team took over as the club's new consulting architects, and re-opened the restored Lower course—after carefully examining Tilly's old plans and reclaiming green sizes and rebuilding bunkers—in May 2021. Hanse's team performed a similar restoration on Baltusrol's Upper course, which reopened in May 2025.