The first World Series was played as an arrangement between the owners of Boston and Pittsburgh clubs rather than a formal arrangement between the two leagues.
PIT 3
Champ
BOS
1903 MLB Champion Boston Americans
z: best record, c: conference winner, y: division winner, w: wildcard, x: clinched playoff spot

World Series

Best of 9-game series
Date    OpponentResultScoreSeries
10/1at Bos. AmericansW  7-3 1-0
10/2at Bos. AmericansL  0-3 1-1
10/3at Bos. AmericansW  4-2 2-1
10/6vs Bos. AmericansW  5-4 3-1
10/7vs Bos. AmericansL  2-11 3-2
10/8vs Bos. AmericansL  3-6 3-3
10/10vs Bos. AmericansL  3-7 3-4
10/13at Bos. AmericansL  0-3 3-5