1978 MLB Losses by Team

The Seattle Mariners led all of MLB in losses in 1978, with 104, 2 ahead of the Toronto Blue Jays. The average across 26 MLB teams is 80.8.

Led all of MLB in 1978 Seattle Mariners 160 games

104 Losses 2 clear of Toronto Blue Jays

#	Team	League	G	L
1	Seattle Mariners	AL	160	104
2	Toronto Blue Jays	AL	161	102
3	New York Mets	NL	162	96
4	Atlanta Braves	NL	162	93
4	Oakland Athletics	AL	162	93
4	St. Louis Cardinals	NL	162	93
7	Chicago White Sox	AL	161	90
7	Cleveland Indians	AL	159	90
9	Minnesota Twins	AL	162	89
10	Houston Astros	NL	162	88
11	Montreal Expos	NL	162	86
12	Chicago Cubs	NL	162	83
	MLB average			80.8
13	San Diego Padres	NL	162	78
14	Detroit Tigers	AL	162	76
15	California Angels	AL	162	75
15	Texas Rangers	AL	162	75
17	Pittsburgh Pirates	NL	161	73
17	San Francisco Giants	NL	162	73
19	Philadelphia Phillies	NL	162	72
20	Baltimore Orioles	AL	161	71
21	Kansas City Royals	AL	162	70
22	Cincinnati Reds	NL	161	69
22	Milwaukee Brewers	AL	162	69
24	Los Angeles Dodgers	NL	162	67
25	Boston Red Sox	AL	163	64
26	New York Yankees	AL	163	63

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.