• May 12: After a slow start to the season, the team has a winning record for the first time, at 10–9, with a 10–5 win over the
Cleveland Naps at
League Park in
Cleveland. • June 1: With a 20–15 record, Boston moves into first place in the AL, a half-game ahead of the
St. Louis Browns. • June 9: The team's longest winning streak of the season, 11 games between May 28 and June 8, comes to an end with a loss to the visiting
Detroit Tigers. • June 21:
Buck Freeman is the first player in franchise history to
hit for the cycle, in a road win at Cleveland. • June 23: With a 33–20 record, Boston regains the AL lead, which they will not relinquish through the end of the season. • June 30:
Nick Altrock starts and pitches eight innings in a 10–3 road loss to the
Chicago White Sox;
Henry Killilea had met with Stahl on April 27, 1903, promising him $500 a month to play catcher for the Boston Americans. Stahl would make his debut with the Americans on June 6. • July 2:
Pitcher Nick Altrock is released by the Boston Americans, and is immediately signed by the
Chicago White Sox.
Statistical leaders The offense was led by
Buck Freeman, who hit 13
home runs and had 104
RBIs, and
Patsy Dougherty with a .331
batting average. It was Freeman's third consecutive season with at least 100 RBIs. The pitching staff was led by
Cy Young, who made 40 appearances (35 starts) and pitched 34 complete games with a 28–9 record and 2.08
ERA, while striking out 176 in innings. The team had two other 20-game winners;
Bill Dinneen (21–13) and
Tom Hughes (20–7). == Season log ==