In golf, winning all of the sport's major championships in the same calendar year constitutes the Grand Slam. The modern (professional) Grand Slam would mean winning The Open Championship, U.S. Open, PGA Championship and Masters Tournament in the same year. Before the rise of professional tournament golf, the Grand Slam was achieved in 1930 when Bobby Jones won the four major championships of that era: The Amateur Championship, The Open Championship, the United States Open, and the United States Amateur.
'If McIlroy feels free that could be a scary thing'
Open champion Xander Schauffele is backing Rory McIlroy to quickly add to his five majors now he has completed the Grand Slam.
BBC News