 Complete the following phrase:  Dow Finsterwald finished ahead of Billy Casper and Sam Snead in 1958 at Llanerch, the first PGA Championship held after the format was switched from match play to stroke play. Lee Trevino defeated Jack Nicklaus in an 18-hole playoff in 1971 at Merion when he famously tossed a rubber snake at Nicklaus on the first tee on the day of the playoff. The US Open returned to Merion in 