Best Regular-Season Record in MLB History

The best regular-season record in MLB history splits two ways: the 1906 Chicago Cubs own the best win percentage of the modern era at .763 (116-36), while the 2001 Seattle Mariners share the record for most wins with 116 (116-46). Tellingly, neither team won the World Series that season.

Baseball’s long schedule makes a dominant record especially meaningful, because it reflects excellence sustained over 150-plus games rather than a hot few weeks. Yet the sport also has the most humbling postseason in team sports, a short series where anything can happen, which is why so many of the greatest regular-season teams fell short in October. Here is the full leaderboard and what it reveals. All figures are through the 2025 season.

Two records, two measures

Because the length of the MLB season has changed, “best record” has two legitimate answers. The 1906 Cubs played a 154-game schedule and won 116 for a .763 win percentage, the highest of the modern era. The 2001 Mariners played 162 games and also won 116, but their percentage was .716 because they played eight more games. The Cubs win on rate; the Mariners tie on total.

Both numbers are extraordinary. Reaching 116 wins requires winning roughly seven of every ten games for six straight months, a pace only two teams in over a century have managed.

The full leaderboard of MLB regular seasons

The table below ranks some of the best regular seasons in modern MLB history by wins and win percentage, along with how each ended.

Team	Season	Record	Win%	How it ended
Chicago Cubs	1906	116-36	.763	Lost World Series
Seattle Mariners	2001	116-46	.716	Lost ALCS
Pittsburgh Pirates	1909	110-42	.724	Won World Series
Cleveland Indians	1954	111-43	.721	Lost World Series
New York Yankees	1998	114-48	.704	Won World Series

The Cubs and Mariners head the list on their respective measures, with the 1909 Pirates, 1954 Indians and 1998 Yankees close behind. The “how it ended” column tells its own story: for every 1998 Yankees who capped a dominant year with a title, there is a 1906 Cubs or 2001 Mariners who did not.

The 1906 Cubs: rate dominance

The 1906 Chicago Cubs remain the gold standard for a single-season win rate. Their 116-36 record and .763 percentage came in the deadball era, built on elite pitching and defense, and no modern team has come close to that rate over a full season. The sting is that they lost the World Series to the crosstown White Sox, the “Hitless Wonders,” in one of the sport’s early upsets.

That the best team by percentage in over a century failed to win the title set an early template for the disconnect between regular-season and postseason success in baseball.

The 2001 Mariners: volume dominance

Nearly a century later, the 2001 Seattle Mariners matched the win total in the expanded 162-game era. Led by Ichiro Suzuki’s record-setting debut season and a deep, balanced roster, Seattle won 116 games, tying the Cubs for the most ever. But the Mariners lost the American League Championship Series to the New York Yankees, never even reaching the World Series.

Their season is now the go-to example of how MLB’s postseason format can neutralize a juggernaut, a cautionary tale invoked every time a modern team runs away with the regular season.

Why the record matters

MLB’s best regular-season records celebrate the value of consistency across a marathon schedule, while also highlighting the gap between the regular season and the playoffs. Understanding what makes a team good over 162 games often comes down to pitching and run prevention, concepts explored in our explainers on the quality start and BABIP.

The short version: the 1906 Cubs hold the best win percentage in modern MLB history at .763, while the 2001 Mariners share the wins record at 116, and neither won the World Series. Through the 2025 season, 116 wins remains the ceiling no team has surpassed.