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
10/1vs PittsburgL  3-7 0-1
10/2vs PittsburgW  3-0 1-1
10/3vs PittsburgL  2-4 1-2
10/6at PittsburgL  4-5 1-3
10/7at PittsburgW  11-2 2-3
10/8at PittsburgW  6-3 3-3
10/10at PittsburgW  7-3 4-3
10/13vs PittsburgW  3-0 5-3