The demanding setup at Shinnecock Hills Golf Club, site of the June 18-21 event and a prior host in 2018, typically produces scoring separation through firm, fast conditions, thick rough, and narrow fairways that reward precision over the 72-hole stroke-play format. U.S. Open history shows just 33 playoffs across 125 editions, with the most recent in 2008, reflecting USGA course preparations that rarely end in ties after regulation. The deep field of PGA Tour professionals, combined with recent major trends favoring outright winners rather than aggregates, supports trader consensus around a 26.5% implied probability for a two-hole playoff followed by sudden death. No major pre-tournament roster changes or weather shifts have altered that positioning ahead of the opening round.