The 1973 Major League Baseball season was the first season of play for the designated hitter in the American League. The Kansas City Royals moved their home games from Municipal Stadium to the new Royals Stadium, adjacent to the Chiefs' football facility, Arrowhead Stadium. Royals Stadium also played host to the 1973 All-Star Game on July 24, with the NL defeating the AL, 7–1.
California Angels ace pitcher Nolan Ryan broke Sandy Koufax's 1965 strikeout record of 382 when he struck out 383 batters during the season.
The Oakland Athletics won their second straight World Series championship in seven games, over the New York Mets. Taken from https://en.wikipedia.org/wiki/1973_Major_League_Baseball_season

Final Stats:

Team	Wins	Losses
CIN	99	63
BAL	97	65
LAD	95	66
OAK	94	68
BOS	89	73
SFG	88	74
KCR	88	74
DET	85	77
NYM	82	79
HOU	82	80
MIN	81	81
STL	81	81
NYY	80	82
PIT	80	82
MON	79	83
CAL	79	83
CHC	77	84
CHW	77	85
ATL	76	85
MIL	74	88
PHI	71	91
CLE	71	91
SDP	60	102
TEX	57	105
Postseason
WorldSeries (4-3):	Oakland Athletics over New York Mets
ALCS (3-2):	Oakland Athletics over Baltimore Orioles
NLCS (3-2):	New York Mets over Cincinnati Reds
Most Runs per game: 5
ATL
Fewest Runs allowed per game: 4
BAL
Regular Season ran from: 4/5-10/1
Playoffs ran from: 10/6-10/21
Best Division: AL East, NL East
Worst Division: NL East