1990 AL Earned Run Average by Team

The Oakland Athletics led the AL in earned run average in 1990, with 3.18, 0.43 ahead of the Chicago White Sox. The average across 14 AL teams is 3.92.

Led the AL in 1990 Oakland Athletics 162 games

3.18 Earned Run Average 0.43 clear of Chicago White Sox

#	Team	G	ERA
1	Oakland Athletics	162	3.18
2	Chicago White Sox	162	3.61
3	Boston Red Sox	162	3.72
3	Seattle Mariners	162	3.72
5	California Angels	162	3.81
6	Texas Rangers	162	3.83
7	Toronto Blue Jays	162	3.84
	AL average		3.92
8	Kansas City Royals	161	3.93
9	Baltimore Orioles	161	4.07
10	Milwaukee Brewers	162	4.11
11	Minnesota Twins	162	4.14
12	New York Yankees	162	4.23
13	Cleveland Indians	162	4.27
14	Detroit Tigers	162	4.39

A team's total is its players' numbers for the club added up, so a player traded mid-season counts for each team only what he did there. Rates such as ERA and batting average are worked out from the team's summed totals, not averaged across players.