<P> In the modern era, the Grand Slam requires victories at the Masters Tournament, the U.S. Open, The Open Championship (also known as the British Open), and the PGA Championship in a single calendar year . </P> <P> Prior to the creation of the Masters Tournament, the national amateur championships of the U.S. and the UK were considered major championships . During that earlier era, the Grand Slam comprised consecutive victories at the U.S. Amateur, British Amateur along with the U.S. Open and the Open Championship . </P> <P> Only Bobby Jones has ever completed a Grand Slam . No man has ever achieved a modern era Grand Slam . Tiger Woods won all four major events consecutively within a 365 - day period, but his victories were spread over two calendar years . </P> <P> The term also refers to a former tour tournament, the PGA Grand Slam of Golf, an annual off - season tournament (that was cancelled after the 2014 tournament) contested by the winners of the four major championships . </P>

Who has won all four golf majors in one year