Overview
The Grand Slam in professional golf is winning all of golf's major championships in the same calendar year. The only player who has accomplished this feat is Bobby Jones in 1930, winning the four major tournaments of that era: the British Amateur, the British Open, the United States Open, and the United States Amateur. Modern variations include a Career Grand Slam: winning all of the major tournaments within a player's career and the Tiger Slam: winning four consecutive major titles but not in the same calendar year (named after Tiger Woods, the only player to accomplish the feat).
Men's golf
The Grand Slam in men's golf is an unofficial term for winning all four major championships in the same year.
In the modern era, the Grand Slam requires victories in four tournaments in a single calendar year (listed in current playing order):
Masters Tournament, held the week ending on the 2nd Sunday in April – hosted as an invitational by and played at Augusta National Golf Club
PGA Championship (also known as the "United States PGA Championship" or "USPGA"), held the week ending on the 3rd Sunday in May, one week before Memorial Day weekend – hosted by the PGA of America and played at various locations in the United States. Prior to 2019, it was held in mid-August, three weeks before Labor Day weekend.
U.S. Open, held the week ending on the 3rd Sunday in June – hosted by the USGA and played at various locations in the United States.
The Open Championship ("The Open", sometimes called "the British Open" outside the UK), held the week containing the 3rd Friday in July – hosted by The R&A and always played on a links course at one of several predetermined locations in the United Kingdom on a rota basis.
From Wikipedia (CC BY-SA 4.0).