Why Is It Called the World Series in Baseball?

By Sarah Miller · January 24, 2054

The World Series in baseball is the annual championship series of Major League Baseball (MLB) in the United States and Canada, contested between the champions of the American League (AL) and the National League (NL). Despite its name, it does not involve teams from other countries; the title “World Series” originated in the early 20th century when the U.S. was the primary hub of professional baseball, making the event effectively a “world” championship by default.

Origins of the Name “World Series”

The term “World Series” dates back to 1903, when the first modern postseason championship was held between the Pittsburgh Pirates (NL) and the Boston Americans (AL). The name was popularized by journalists and promoters who referred to it as the “World's Championship Series” or simply “World's Series.” At the time, professional baseball was almost entirely concentrated in the United States, with no comparable leagues elsewhere in the world.

Early Promotional Language

Newspapers and team owners used grandiose language to elevate the prestige of the matchup. The phrase “World Series” was catchy and helped market the event as the ultimate contest in baseball.

The term was first officially used in print by The Boston Post in 1903.
By 1905, the New York Giants' manager, John McGraw, embraced the name, solidifying its usage.
Despite brief attempts to rename it “The Championship Series,” “World Series” remained dominant.

Why “World” If Only U.S. Teams Play?

It's a common question: why call it the “World Series” if only MLB teams from the U.S. (and one from Canada) compete? The answer lies in historical context.

Baseball's Global Landscape in the Early 1900s

In the early 20th century, baseball was not widely professionalized outside North America. Leagues in Japan, Latin America, and the Caribbean existed but were either amateur or semi-professional. MLB was the undisputed pinnacle of the sport.

No international club competition challenged MLB's supremacy until the late 20th century.
The name stuck due to tradition, even as global baseball grew.
Today, the term is preserved for branding and historical continuity.

Evolution of the World Series Format

Over more than a century, the structure of the World Series has evolved significantly.

Key Format Changes

Year	Change	Description
1903	First Series	Best-of-nine format; Boston won 5–3.
1905	Permanent Adoption	Series became annual after hiatus in 1904.
1922	Best-of-Seven	Switched from best-of-nine to best-of-seven.
1969	League Championship Series	Introduced playoffs before the World Series.
1995	Wild Card	Expanded playoff access beyond division winners.
2012	Second Wild Card	Added extra team per league, expanding playoffs.

International Participation and the Future

While the World Series remains an intra-MLB event, MLB has made efforts to globalize the game.

Global Initiatives by MLB

World Baseball Classic (WBC): Launched in 2006, this tournament features national teams and is often seen as a true “world series” of baseball.
Regular-season games abroad: MLB has hosted games in London, Mexico City, Tokyo, and Sydney to expand reach.
Player diversity: Over 25% of MLB players are born outside the U.S., representing more than 20 countries.

Year	World Series Champion	Manager	Non-U.S.-Born Players on Roster (%)	Global TV Viewership (Est.)
2018	Boston Red Sox	Alex Cora (PUR)	32%	18 million
2019	Washington Nationals	Dave Martinez (USA)	28%	17.5 million
2020	Los Angeles Dodgers	Dave Roberts (USA)	35%	12 million
2021	Atlanta Braves	Brian Snitker (USA)	30%	14 million
2022	Houston Astros	Dusty Baker (USA)	38%	13.8 million
2023	Texas Rangers	Bruce Bochy (USA)	41%	15 million

Table data source:1, 2, 3

The data shows a steady increase in international player representation on World Series rosters, reflecting MLB's globalization. Despite the domestic scope of the competition, the cultural and athletic influence of the World Series is truly worldwide, with growing international viewership and diverse team compositions.

Frequently Asked Questions About the World Series

Why is it called the World Series if only American teams play?

The name originated in 1903 when the U.S. was the center of professional baseball. With no strong international leagues, the championship was considered the de facto world title. The name persisted due to tradition and branding, even as baseball expanded globally.

Has a non-U.S. team ever won the World Series?

Yes, the Toronto Blue Jays from Canada won the World Series in 1992 and 1993, making them the only non-U.S. team to do so. Their victories highlight that while most teams are American, the Series includes Canadian representation.

Is there a real world championship for baseball clubs?

Not currently. While the World Baseball Classic (WBC) serves as a global national team championship, there is no official interleague world club series. MLB has discussed formats like a “Club World Series,” but none have been implemented.

How did the World Series format change over time?

It began as a best-of-nine series in 1903, switched to best-of-seven in 1922, and expanded with the addition of League Championship Series (1969), Wild Cards (1995), and a second Wild Card (2012) to include more teams in the playoff race.

Does the World Series winner get recognized as world champion?

Within the context of MLB and American sports media, yes. However, internationally, the title is understood as the MLB championship rather than a literal world club title. The World Baseball Classic is more widely recognized as the sport’s true global championship.