2018 MLB Losses by Team

The Baltimore Orioles led all of MLB in losses in 2018, with 115, 11 ahead of the Kansas City Royals. The average across 30 MLB teams is 81.0.

Led all of MLB in 2018 Baltimore Orioles 162 games

115 Losses 11 clear of Kansas City Royals

#	Team	League	G	L
1	Baltimore Orioles	AL	162	115
2	Kansas City Royals	AL	162	104
3	Chicago White Sox	AL	162	100
4	Detroit Tigers	AL	162	98
4	Miami Marlins	NL	161	98
6	San Diego Padres	NL	162	96
7	Cincinnati Reds	NL	162	95
7	Texas Rangers	AL	162	95
9	San Francisco Giants	NL	162	89
9	Toronto Blue Jays	AL	162	89
11	New York Mets	NL	162	85
12	Minnesota Twins	AL	162	84
13	Los Angeles Angels of Anaheim	AL	162	82
13	Philadelphia Phillies	NL	162	82
	MLB average			81.0
15	Arizona Diamondbacks	NL	162	80
15	Washington Nationals	NL	162	80
17	Pittsburgh Pirates	NL	161	79
18	St. Louis Cardinals	NL	162	74
19	Seattle Mariners	AL	162	73
20	Atlanta Braves	NL	162	72
20	Colorado Rockies	NL	163	72
20	Tampa Bay Rays	AL	162	72
23	Cleveland Indians	AL	162	71
23	Los Angeles Dodgers	NL	163	71
25	Chicago Cubs	NL	163	68
26	Milwaukee Brewers	NL	163	67
27	Oakland Athletics	AL	162	65
28	New York Yankees	AL	162	62
29	Houston Astros	AL	162	59
30	Boston Red Sox	AL	162	54

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.