Grand slam

Baseball: When a player hits a home run with the bases loaded.

Tennis: Successfully winning all four majors -- the U.S. Open, Wimbledon, the French Open, and the Australian Open -- in the same season. See Grand Slam (tennis).

Golf: Successfully winning all four majors -- the U.S. Open, the Masters, the British Open, and PGA Championship -- in the same season. See Grand Slam (golf).