The 2005 Major League Baseball season was notable for the league's new steroid policy in the wake of the BALCO scandal, which enforced harsher penalties than ever before for steroid use in Major League Baseball. Several players, including veteran Rafael Palmeiro, were suspended under the new policy. Besides steroids it was also notable that every team in the NL East finished the season with at least 81 wins. Additionally it was the first season featuring a baseball team in Washington, D.C. since the second iteration of the Washington Senators last played there in 1971; the Washington Nationals had moved from Montreal, the first relocation of a team in 33 years and currently the most recent time this has occurred in the majors.
The 2004 Major League Baseball season ended when the Boston Red Sox defeated the St. Louis Cardinals in a four-game World Series sweep. The Red Sox championship ended an 86-year-long drought known as the Curse of the Bambino. The Red Sox were also the first team in MLB history and the third team from a major North American professional sports league ever to come back from a 3–0 postseason series deficit and win. This happened in the ALCS against the New York Yankees.
The 2006 Major League Baseball season ended with the National League's St. Louis Cardinals winning the World Series with the lowest regular-season victory total (83) in a fully-played season in major league history. The Atlanta Braves failed to qualify for the postseason for the first time since 1990. Individual achievements included Barry Bonds who, despite questions surrounding his alleged steroid use and involvement in the BALCO scandal, surpassed Babe Ruth for second place on the career home runs list. The American League continued its domination at the All-Star Game by winning its fourth straight game, and ninth of the prior 10 contests.
The 2007 Major League Baseball season began on April 1 with a rematch of the 2006 National League Championship Series; the St. Louis Cardinals and New York Mets played the first game of the season at Busch Stadium in St. Louis, Missouri, which was won by the Mets, 6–1. The regular season concluded with seven teams entering the postseason who had failed to reach the 2006 playoffs including all National League teams, with only the New York Yankees returning; a dramatic one-game playoff between the Colorado Rockies and San Diego Padres; and the largest September collapse for a leading team in baseball history, with the Mets squandering a 7-game lead with 17 to play, losing on the final day of the regular season, and the Philadelphia Phillies capturing the National League East for the first time since 1993. The season ended on October 28, with the Boston Red Sox sweeping the World Series over the Rockies, four games to zero.
The 2001 Major League Baseball season finished with the Arizona Diamondbacks defeating the New York Yankees in seven games for the World Series championship. The September 11 terrorist attacks on New York and Washington, D.C. pushed the end of the regular season from September 30 to October 7. Because of the attacks, the World Series was not completed until November 4. The 2001 World Series was the first World Series to end in November.
The 2002 Major League Baseball season finished with two wild-card teams contesting the World Series; the Anaheim Angels defeated the San Francisco Giants in seven games for the World Series championship. It was the first title in Angels team history. This was the first season for MLB.tv.
The 1997 Major League Baseball season was the inaugural season for Interleague play, as well as the final season in the American League for the Milwaukee Brewers before moving to the NL the following season. The California Angels changed their name to the Anaheim Angels. The Florida Marlins ended the season as the World Champions defeating the Cleveland Indians in a seven-game World Series, four games to three.
The 1998 Major League Baseball season ended with the New York Yankees sweeping the San Diego Padres in the World Series, after they had won a then AL record 114 regular season games. The Yankees finished with 125 wins for the season, which remains the MLB record.
The 1996 Major League Baseball season was the final season of league-only play before the beginning of interleague play the following season. The season ended with the New York Yankees defeating the defending champion Atlanta Braves in six games for the World Series title, the Yankees' first championship since 1978. The record for most home runs hit in an MLB regular season, set at 4,458 in 1987, was broken, as the AL and NL combined to hit 4,962 home runs. Only 196 shutouts were recorded in the 2,266 MLB regular-season games. This was the first season in the Divisional Series era to be played to the full 162 games, as the 1994–95 player's strike caused the first two seasons of the era to be abbreviated.
The 1993 Major League Baseball season was the final season of two-division play in each league, before the Central Division was added the following season, giving both the NL and AL three divisions each.
The 1935 major league baseball season began on April 16, 1935. The regular season ended on September 29, with the Chicago Cubs and Detroit Tigers as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 32nd World Series on October 2 and ended with Game 6 on October 7. The Tigers defeated the Cubs, four games to two.
The 1962 Major League Baseball season was contested from April 9 to October 16, 1962. The National League (NL) added two teams via expansion, the Houston Colt .45s and New York Mets. This marked the return of the NL to New York City after a four-year absence, although the Mets would lose 120 games and finish in last place. All major league teams now played 162-game schedules, which had been adopted by the American League (AL) the prior season, with each team facing the nine other clubs in the same league 18 times during the season.
The 1966 Major League Baseball season was contested from April 11 to October 9, 1966. The Braves played their inaugural season in Atlanta, following their relocation from Milwaukee. Three teams played the 1966 season in new stadiums. On April 12, the Braves ushered in Atlanta–Fulton County Stadium with the Pittsburgh Pirates taking a 3–2 win in 13 innings. One week later, Anaheim Stadium opened with the California Angels losing to the Chicago White Sox, 3–1 in the Angels' debut following their move from Los Angeles to nearby Orange County. On May 8, the St. Louis Cardinals closed out old Sportsman's Park/Busch Stadium I with a 10–5 loss to the San Francisco Giants before opening the new Busch Memorial Stadium four days later with a 4–3 win in 12 innings over the Atlanta Braves.
The 1967 Major League Baseball season was contested from April 10 to October 12, 1967. The St. Louis Cardinals defeated the Boston Red Sox four games to three in the World Series, which was the first World Series appearance for the Red Sox in 21 years. Following the season, the Kansas City Athletics relocated to Oakland.
The 1948 major league baseball season began on April 19, 1948. The regular season ended on October 4, with the Boston Braves and Cleveland Indians as the regular season champions of the National League and American League, respectively. The Indians won the American League title via a tie-breaker game victory over the Boston Red Sox, after both teams finished their 154-game schedules with identical 96–58 records. This was the second regular season tie-breaker, and saw a change from the previous three-game format to that of a single-game, Game 163. The postseason began with Game 1 of the 45th World Series on October 6 and ended with Game 6 on October 11. The Indians defeated the Braves, four games to two.
The 1922 major league baseball season began on April 12, 1922. The regular season ended on October 1, with the New York Giants and New York Yankees were the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 19th World Series on October 4 and ended with Game 5 on October 8. In a repeat of the previous season, the Giants defeated the Yankees, four games to zero.
The 1923 major league baseball season began on April 17, 1923. The regular season ended on October 7, with the New York Giants and New York Yankees as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 20th World Series on October 10 and ended with Game 6 on October 15. In the third consecutive iteration of the Subway Series, the Yankees defeated the Giants, four games to two.
The 1927 major league baseball season began on April 12, 1927. The regular season ended on October 2, with the Pittsburgh Pirates and New York Yankees as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 24th World Series on October 5 and ended with Game 4 on October 8. The Yankees swept the Pirates in four games.
The 1941 major league baseball season began on April 14, 1941. The regular season ended on September 28, with the Brooklyn Dodgers and New York Yankees as the regular season champions of the National League and American League, respectively. The postseason began with Game 1 of the 38th World Series on October 1 and ended with Game 5 on October 6. The Yankees defeated the Dodgers, four games to one.
The 2009 Major League Baseball season began on April 5, 2009; the regular season was extended two days for a one-game playoff between the Detroit Tigers and the Minnesota Twins for the American League Central title. The postseason began the next day with the Division Series. The World Series began on October 28, and ended on November 4, with the New York Yankees defeating the Philadelphia Phillies in six games. This was the second time the season was completed in November. The only other occasion was the 2001 World Series, because of the delaying of the end of that season due to the September 11 attacks as November baseball would be guaranteed when Game 4 was played on Sunday, November 1. Had the 2009 World Series gone the full seven games, Game 7 would've been played on November 5, the latest date ever scheduled for a World Series game. It became the latest date for a World Series game in 2022. The American League champion had home field advantage for the World Series by virtue of winning the All-Star Game on July 14 at Busch Stadium in St. Louis, Missouri, 4–3. In addition, the annual Civil Rights Game became a regular season game, and was played June 20 at Great American Ball Park in Cincinnati, Ohio, when the host Cincinnati Reds lost to the Chicago White Sox in an interleague game, 10–8. Both teams wore replicas of their 1965 uniforms in the contest.
