2018 MLB Winning Percentage by Team

The Boston Red Sox led all of MLB in winning percentage in 2018, with .667, .031 ahead of the Houston Astros. The average across 30 MLB teams is .500.

Led all of MLB in 2018 Boston Red Sox 162 games

.667 Winning Percentage .031 clear of Houston Astros

#	Team	League	G	W-L%
1	Boston Red Sox	AL	162	.667
2	Houston Astros	AL	162	.636
3	New York Yankees	AL	162	.617
4	Oakland Athletics	AL	162	.599
5	Milwaukee Brewers	NL	163	.589
6	Chicago Cubs	NL	163	.583
7	Los Angeles Dodgers	NL	163	.564
8	Cleveland Indians	AL	162	.562
9	Colorado Rockies	NL	163	.558
10	Atlanta Braves	NL	162	.556
10	Tampa Bay Rays	AL	162	.556
12	Seattle Mariners	AL	162	.549
13	St. Louis Cardinals	NL	162	.543
14	Pittsburgh Pirates	NL	161	.509
15	Arizona Diamondbacks	NL	162	.506
15	Washington Nationals	NL	162	.506
	MLB average			.500
17	Los Angeles Angels of Anaheim	AL	162	.494
17	Philadelphia Phillies	NL	162	.494
19	Minnesota Twins	AL	162	.482
20	New York Mets	NL	162	.475
21	San Francisco Giants	NL	162	.451
21	Toronto Blue Jays	AL	162	.451
23	Cincinnati Reds	NL	162	.414
23	Texas Rangers	AL	162	.414
25	San Diego Padres	NL	162	.407
26	Detroit Tigers	AL	162	.395
27	Miami Marlins	NL	161	.391
28	Chicago White Sox	AL	162	.383
29	Kansas City Royals	AL	162	.358
30	Baltimore Orioles	AL	162	.290

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.