BETHESDA, Md. -- You could say the odds are with Rory McIlroy. McIlroy's six-stroke lead ties Tiger Woods in 2000 at Pebble Beach for the largest 36 hole lead. Woods went on to win by 15 shots over Ernie Els. In the other majors, record 36-hole leaders have won five of six times. The largest 36-hole lead at the Masters is five strokes -- by Herman Keiser in 1946, Jack Nicklaus in 1975 and Raymond Floyd in 1976. All three players went on to win. Louis Oosthuizen's five-stroke lead at last year's British Open at St. Andrews tied Bobby Clampett's lead at Royal Troon in 1982. Oosthuizen won, Clampett did not. Nick Price holds the 36-hole lead record in the PGA. He led in 1994 and went on to win.