1964 Official US Open Golf Programme: 64th Open Championship 18-20 June played at Congressional Country Club Washington DC. Ken Venturi won his only major title, four strokes ahead of runner-up Tommy Jacobs. Jacobs held the 36-hole lead after shooting a 64 (?6) in the second round, tying the US Open record at the time for a round, set by Lee Mackey in 1950 - clean throughout