1903 World Series

In 1901, Ban Johnson, president of the Western League, a minor league organization, formed the American League to take advantage of the National League's 1900 contraction from twelve teams to eight. Johnson and fellow owners raided the National League and signed away many star players, including Cy Young and Jimmy Collins. Johnson had a list of 46 National Leaguers he targeted for the American League; by 1902, all but one had made the jump.[1]^: 99 The constant raiding, however, nixed the idea of a championship between the two leagues. Pirates owner Barney Dreyfuss, whose team ran away with the 1902 National League pennant, was open to a postseason contest and even said he would allow the American League champion to stock its roster with all-stars.[1]^: 105 However, Johnson had spoken of putting a team in Pittsburgh and even attempted to raid the Pirates' roster in August 1902, which soured Dreyfuss. At the end of the season, however, the Pirates played a group of American League All-Stars in a four-game exhibition series, winning two games to one, with one tie.[1]^: 102

The leagues finally called a truce in the winter of 1902–03 and formed the National Commission to preside over organized baseball. The following season, the Boston Americans and Pittsburgh Pirates had secured their respective championship pennants by September. That August, Dreyfuss challenged the American League to an 11-game championship series. Encouraged by Johnson and National League President Harry Pulliam, Americans owner Henry J. Killilea met with Dreyfuss in Pittsburgh in September and instead agreed to a best-of-nine championship, with the first three games played in Boston, the next four in Allegheny City, and the remaining two (if necessary) in Boston.[1]^: 122

One significant point about this agreement was that it was an arrangement primarily between the two clubs rather than a formal arrangement between the leagues. In short, it was a voluntary event, a fact which would result in no Series at all for 1904. The formal establishment of the Series as a compulsory event started in 1905.[3]

Jimmy Sebring hit the first home run in World Series history, an inside-the-park home run in Game 1.

The Pirates started Game 1 strong, scoring six runs in the first four innings, and held on to win the first World Series game in baseball history. They extended their lead to 7–0 on an inside-the-park home run by Jimmy Sebring in the seventh, the first home run in World Series history. Boston scored a few runs in the last three innings, but it was too little, too late; they ended up losing 7–3 in the first ever World Series game. Both Phillippe and Young threw complete games, with Phillippe striking out ten and Young fanning five, but Young also gave up twice as many hits and allowed three earned runs to Phillippe's two.

In Game 2, Patsy Dougherty hit the first over-the-fence home run in World Series history.

After starting out strong in Game 1, the Pirates simply shut down offensively, eking out a mere three hits, all singles. Pittsburgh starter Sam Leever went 1 inning and gave up three hits and two runs, before his ailing arm forced him to leave in favor of Bucky Veil, who finished the game. Bill Dinneen struck out 11 and pitched a complete game for the Americans, while Patsy Dougherty hit home runs in the first and sixth innings for two of the Boston's three runs. The Americans' Patsy Dougherty led off the Boston scoring with an inside-the-park home run, the first time a lead-off batter did just that until Alcides Escobar of the Kansas City Royals duplicated the feat in the 2015 World Series, 112 years later. Dougherty's second home run was the first in World Series history to actually sail over the fence, an incredibly rare feat at the time.

Members of the Boston Police Department at Huntington Avenue Grounds during the series

Phillippe, pitching after only a single day of rest, started Game 3 for the Pirates and didn't let them down, hurling his second complete-game victory of the Series to put Pittsburgh up two games to one.

Game 4 at Exposition Park

After two days of rest, Phillippe was ready to pitch a second straight game. He threw his third complete-game victory of the series against Bill Dinneen, who was making his second start of the series. But Phillippe's second straight win was almost not to be, as the Americans, down 5–1 in the top of the ninth, rallied to narrow the deficit to one run. The comeback attempt failed, as Phillippe managed to put an end to it and give the Pirates a commanding 3–1 series lead.

Game 5 winning pitcher Cy Young

Game 5 was a pitcher's duel for the first five innings, with Boston's Cy Young and Pittsburgh's Brickyard Kennedy giving up no runs. That changed in the top of the sixth, however, when the Americans scored a then-record six runs before being retired. Young, on the other hand, managed to keep his shutout intact before finally giving up a pair of runs in the bottom of the eighth. He went the distance and struck out four for his first World Series win.

Game 6 winning pitcher Bill Dinneen

Game 6 was a rematch between the starters of Game 2, Boston's Dinneen and Pittsburgh's Leever. Leever pitched a complete game this time but so did Dinneen, who outmatched him to earn his second complete-game victory of the series. After losing three of the first four games of the World Series, the underdog Americans had tied the series at three games apiece.

Souvenir card of the "World's Championship Games"

The fourth and final game in Allegheny saw Phillippe start his fourth game of the Series for the Pirates. This time, however, he did not fare as well as he did in his first three starts. Cy Young, in his third start of the Series, held the Pirates to three runs and put the Americans ahead for the first time as the Series moved back to Boston.

The final game of this inaugural World Series started out as an intense pitcher's duel, scoreless until the bottom of the fourth when Hobe Ferris hit a two-run single. Phillippe started his fifth and final game of the series and Dinneen his fourth. As he did in Game 2, Dinneen threw a complete-game shutout, striking out seven and leading his Americans to victory, while Phillippe pitched respectably but could not match Dinneen because his arm had been worn out with five starts in the eight games, giving up three runs to give the first 20th-century World Championship to the Boston Americans, Honus Wagner striking out to end the Series.

Note: GP=Games played; AB=At bats; H=Hits; Avg.=Batting average; HR=Home runs; RBI=Runs batted in

Note: G=Games played; GS=Games started; ERA=Earned run average; W=Wins; L=Losses; IP=Innings pitched; H=Hits; R=Runs; ER= Earned runs; BB=Walks; SO= Strikeouts

Note: GP=Games played; AB=At bats; H=Hits; Avg.=Batting average; HR=Home runs; RBI=Runs batted in

Note: G=Games played; GS=Games started; ERA=Earned run average; W=Wins; L=Losses; IP=Innings pitched; H=Hits; R=Runs; ER= Earned runs; BB=Walks; SO= Strikeouts