1903: Year first World Series was played (Boston won the nine-game series over Pittsburgh, 5-3)

1933: Year of first All-Star game between American League and National League players

16: Number of years Baltimore Orioles shortstop Cal Ripken Jr. played without missing a game

14: Number of players, including Lou Gehrig and Willy Mays, who have hit four home runs in one game

27: Number of seasons pitcher Nolan Ryan played in Major League Baseball

Source: factmonster.com