The Masters. The U.S. Open. The Open Championship. The PGA Championship. People pay attention to golf year-round, but there's no doubt more eyes focus in on golf's four majors, which carry the most prestige for the winner.
The same goes for tennis' four majors: the Australian Open, the French Open, Wimbledon, and the U.S. Open.
Poker isn't a sport — we'll talk more about that later — but there's a natural parallel to be drawn between poker and golf/tennis as competitions of individuals rather than teams who must travel to different parts of the globe to ply their trade on the biggest stages.