How many players have played every position?

Answer 1

At least four. The first major league player to perform the stunt was shortstop Bert Campaneris of the Kansas City A's on September 8, 1965. Against the California Angels, he played his regular position in the first inning, switched to second base in the second and moved to third base in the third. He played left field, center field and right field in the next three innings, respectively, and then played first base in the seventh. In the eighth inning, the ambidextrous Campaneris took the mound and pitched to left-handed batters left handed and right-handers right handed. In the ninth inning, he went behind the plate to catch.

Other players who have duplicated the feat: Cesar Tovar of the Minnesota Twins in 1968, and Scott Sheldon of the Texas Rangers and Shane Halter of the Detroit Tigers in 2000.