Click on any series score to link to that series' page.
Higher seed has home field advantage during Division Series and League Championship Series.
The American League Champion has home field advantage in the World Series as a result of the pre-2003 "alternating years" rule.
* The asterisk denotes the club that won the wild card for its respective league.
NOTE: Oakland did not have to make up one postponed game, because even if they had lost and had finished in a tie with Seattle, they would have been awarded the division title due to winning the season series (9-4) between the teams.
January 6 – Major league officials say that Atlanta Braves reliever John Rocker is to undergo psychological testing following derogatory racist remarks he makes in an interview with Sports Illustrated magazine. Commissioner Bud Selig says he'll listen to what the doctors say before deciding what punishment—if any—is handed down to the pitcher.
January 11 – The baseball writers elect catcher Carlton Fisk and first baseman Tony Pérez to the Hall of Fame. Fisk is chosen in his 2nd year on the ballot, while Pérez is picked on his 9th try.
January 31 – Atlanta Braves reliever John Rocker is suspended from baseball until May 1 by Commissioner Bud Selig for his racial and ethnic remarks in an article published in Sports Illustrated last month. He is also fined an undisclosed amount and ordered to undergo sensitivity training.
March 1 – Independent arbitrator Shyam Das cuts Atlanta Braves pitcher John Rocker's suspension from 28 days to 14 days. Rocker, who is allowed to report to spring training with the team, also has his fine cut.
April 7 – A total of 57 home runs are hit in the 15 games played, for a new major league record. The previous mark of 55 was set in 17 games on August 13, 1999. There are 36 homers hit in the AL, smashing the previous mark for a single league.
April 15 – The Baltimore Orioles defeat the Minnesota Twins, 6–4, as Cal Ripken, Jr. gets the 3,000th hit of his illustrious career. Ripken goes 3-for-5 in becoming the 24th player to reach the milestone, and the seventh to get 3,000 hits and 400 home runs.
April 21 – The Anaheim Angels melt the Tampa Bay Devil Rays 9–6. Mo Vaughn and Tim Salmon hit back-to-back home runs for Anaheim in the fourth inning, then repeat the feat in the ninth. Troy Glaus also homers in those same two innings, marking the first time in major league history that three players homer in the same inning twice in the same game. The three players with two home runs in the game ties another major league record.
April 30 – The St. Louis Cardinals defeat the Philadelphia Phillies, 4–3, as Mark McGwire and Jim Edmonds hit home runs. St. Louis finishes the month with 55 homers, a new record for the month of April. It also ties the National League mark for homers in any month. Major league batters also set a record for most home runs in a month by hitting 931 in April – the total is 140 more than the number hit in 1999.
May 10 – Rickey Henderson becomes the 21st major leaguer to garner 10,000 at-bats in his career. Henderson finishes the night with 10,002 at bats and trails only Cal Ripken, Jr. among active players.
May 11 – The Milwaukee Brewers crash into the Chicago Cubs, 14–8, in the longest nine-inning played in National League history. Not only is the game memorable for Milwaukee's four-hour, 22-minute drubbing of Chicago, but also because it features one of the longest home runs in the history of Wrigley Field. A captioned picture circulated by the Associated Press put it this way: "Rick Frohock celebrates on the rooftop of a three-story building on Waveland Ave. behind the left-field bleachers of Wrigley Field after catching a home run hit by Chicago's Glenallen Hill against the Brewers. It is believed to be the first time a ball lands on top of the apartment building." Hill's shot is estimated at 490 feet by the next day's press accounts and eventually measured at 500 feet.
The Montreal Expos announce they will wear Maurice Richard's uniform number 9 on their jerseys for the rest of the season to honor the Montreal Canadiens great who died the previous week. It is believed to be the first time a major league team honored an athlete from another sport in this way.
June 26 – After hitting 35 home runs in 53 Minor league games,Alex Cabrera makes his big league debut with the Arizona Diamondbacks and hits a two-run, pinch-hit home run in the eighth inning. Arizona defeats the Houston Astros, 6–1, while Cabrera becomes the 78th player in Major League Baseball history to homer in his first career at-bat.
July 1 – On Canada's 133rd birthday, the Marlins' Ryan Dempster and the Expos' Mike Johnson hook up in a rare matchup of Canadian starters. Dempster comes out on top as Florida defeats Montreal 6–5. Johnson hails from Edmonton, Alberta, while Dempster is a native of Sechelt, British Columbia. This is the first matchup of Canadian-born starters since September 1999, when Dempster took on Éric Gagné of the Dodgers.
July 5 – Arizona outfielder Luis Gonzalez becomes the first Diamondback to hit for the cycle, helping his team to trip the Astros 12-9. It is the first time the feat is accomplished in new Enron Field, and Gonzalez is just the 9th player to both hit for the cycle and have a 30-or-more-game hitting streak.
July 6 – St. Louis rookie catcher Keith McDonald hits a home run in his second at bat, becoming only the second player in major league history to hit home runs in each of his first two big league at bats. Bob Nieman, in 1951, is the other.
July 8 – In a New York match, the Yankees whip the Mets by identical 4-2 scores in both ends of an unusual day-night doubleheader. With the first game played at Shea Stadium and the nightcap at Yankee Stadium, it is the first time since 1903 that two teams play two games in different stadiums on the same day. Dwight Gooden wins the first game with a six-inning effort in his first start since returning to the Yankees. Roger Clemens wins the nightcap and precipitates a near-brawl when he drills Mike Piazza in the helmet with an inside fastball. Piazza suffers a concussion.
July 15 – A 1909 Honus Wagnerbaseball card is auctioned for a record $1.1 million on eBay. Other high-priced items in the auction include a baseball autographed by the entire 1919 "Chicago Black Sox" team, including Shoeless Joe Jackson as well as the umpires who worked the final game of the 1919 World Series, which sells for $93,666, including a 15% buyer's premium. A ball signed by the 1919 Reds goes for $11,208, while a baseball autographed by Babe Ruth sells for $76,020. A contract from Shoeless Joe Jackson's sale of his Chicago pool hall to teammate Lefty Williams sells for $36,098. The contract, dated October 6, 1921, is for just $1.
July 20 – In a Houston 6-2 win over Cincinnati, Reds pinch-hitter Mike Bell strikes out in his major league debut, making history by becoming part of the first third-generation family to play for the same major league team. His grandfather Gus Bell and father Buddy Bell also played for the Reds.
August 4 – The Blue Jays obtain outfielder Dave Martinez from the Rangers. Martinez becomes the 9th major leaguer to play for four teams in a season. He begins the year with Tampa Bay and also plays with the Cubs, in addition to Texas and Toronto. The last one who did so was Dave Kingman (1977). Before him, according to historian Scott Flatow, the four-in-one players were Frank Huelsman (1904), Willis Hudlin (1940), Paul Lehner (1951), Ted Gray (1955), Wes Covington (1961) and Mike Kilkenny (1972).
August 21 – Potomac's Esix Snead breaks Lenny Dykstra's Carolina League record of 105 stolen bases by swiping his 106th of the season. Snead has a batting average of .242 and a .338 on-base percentage. It was the 10th time in the last 20 years that a minor-leaguer had stolen 100 or more bases in a season. According to Howe Sports data, the eight players who stole 100 or more bases in the minors were:
September 10 – Randy Johnson of the Arizona Diamondbacks becomes the 12th pitcher to reach the 3,000-strikeout plateau, fanning a season-high 14 in seven innings as the Diamondbacks lose to the Florida Marlins 4–3 in 12 innings. Johnson's 3,000 strikeout victim is Mike Lowell, who fans to end the 4th inning. In the first inning, Johnson also records his 300th strikeout for the third consecutive season and the fourth time overall. Nolan Ryan is the only other pitcher to accomplish the feat, and is the only pitcher who reached 300 strikeouts more times with six (1972–74, 1976–77 and 1989).
September 26 – Longtime broadcast partner NBC declines to renew its rights. NBC had televised baseball since 1947, with the exception of 1990–93, and was the exclusive home of the World Series for 27years.
September 27 – In an Oakland 9-7 victory over the Angels, Anaheim's Darin Erstad hits a home run in the 2nd inning for his 99th RBI of the year from the leadoff spot to set a new record. Nomar Garciaparra drove home 98 in 1997 for the previous mark.
September 28 – At Camden Yards, the Orioles bat around in back-to-back innings and set a single-game franchise scoring record in a 23-1 rout of the Toronto Blue Jays.
September 28 – In the final game ever played at Milwaukee's County Stadium the Brewers drop an 8-1 decision to the Cincinnati Reds.
December 1 – Relief pitcher Turk Wendell, who wears uniform number 99, agrees to a three-year deal worth $9,999,999.99 with the New York Mets. Wendell asks that his contract include an option year in which he plays for free, but that plan is unworkable because the MLB collective bargaining agreement set a $200,000 minimum salary.
December 11 – The Texas Rangers sign free agent shortstop Alex Rodriguez to a record $252 million, 10-year contract. It is, at the time, the richest contract in the history of professional sports.
January 1 – Andy Spognardi, 91, infielder for the 1931 Boston Red Sox.
January 4 – John Milner, 50, first baseman and left fielder for the New York Mets and Pittsburgh Pirates, who hit 20 home runs twice, including 10 career grand slams.
January 11 – Bob Lemon, 79, Hall of Fame and seven-time All-Star pitcher who spent his entire career with the Cleveland Indians, winning 207 games, including a no-hitter, while recording seven 20-win seasons and winning final game of the 1948 World Series, before managing the New York Yankees to the 1978 AL Championship Series title.
January 16 – By Saam, 85, broadcaster for the Philadelphia Athletics and Phillies clubs from 1938 through 1975.
January 19 – Manny Montejo, 64, Cuban pitcher for the 1961 Detroit Tigers.
January 19 – Lynn Myers, 85, shortstop who played from 1938 to 1939 for the St. Louis Cardinals.
January 20 – Ron Herbel, 62, relief pitcher for the San Francisco Giants, San Diego Padres, New York Mets and Atlanta Braves in a span of nine seasons from 1963–1971, whose career batting average of .029 (6-for-206) is the worst ever for a major leaguer with a minimum of 100 at bats.
January 26 – Frankie Pack, 75, pinch-hitter for the 1949 St. Louis Browns.
March 2 – Danny Musser, 94, third baseman for the 1932 Washington Senators.
March 2 – Jack Robinson, 79, relief pitcher for the 1949 Boston Red Sox.
March 7 – Jack Sanford, 70, All-Star pitcher who was named 1957 National League Rookie of the Year, and posted a 24-7 record for the 1962 San Francisco Giants.
March 13 – Harry Bright, 70, utility infielder for five different teams between 1958 and 1965, who later became a longtime player and manager in the minor leagues and also served as a scout for several major league organizations.
March 16 – Carlos Velázquez, 73, Puerto Rican pitcher for the 1973 Milwaukee Brewers of the American League.
March 19 – Joanne Weaver, 64, All-Star outfielder for the Fort Wayne Daisies of the All-American Girls Professional Baseball League, who hit a league-leading .429 in 1954, which remains the highest professional baseball single-season average posted in modern era.
March 19 – Dewey Williams, 84, catcher who played from 1944 through 1948 for the Chicago Cubs and the Cincinnati Reds.
March 29 – Hank Miklos, 89, relief pitcher for the 1944 Chicago Cubs, and one of several players who only appeared in the major leagues during World War II.
March 30 – Mary Flaherty, 74, All-American Girls Professional Baseball League player.
April 6 – Don Johnson, 88, twice All-Star second baseman who in 1945 hit .302 with 94 runs and 58 runs batted in as leadoff hitter for the last Chicago Cubs team to win a pennant.
April 13 – Frenchy Bordagaray, 90, outfielder/third baseman who played for six teams during eleven seasons, most of them with the Brooklyn Dodgers, being also a member of the 1941 World Champion Yankees.
April 14 – Bob Barthelson, 73, pitcher for the 1944 New York Giants, and one of several players who only appeared in the major leagues during World War II.
June 2 – Ellis Clary, 83, infielder for the Washington Senators and St. Louis Browns from 1942 through 1945, who later worked as a scout for 32 years.
June 5 – Don Liddle, 75, pitcher for the New York Giants during Game 1 of the 1954 World Series when teammate Willie Mays made his famous over-the-shoulder catch.
June 13 – Bobby Tiefenauer, 70, knuckleball reliever who pitched for six different teams during a ten-year career that stretched between 1952 and 1968.
June 17 – Joe Albanese, 66, pitcher for the 1958 Washington Senators, who also had a significant career in the minor leagues.
June 19 – Tokuji Iida, 76, Hall of Fame first baseman and manager who played for the Nankai Hawks from 1947 to 1957 and the Kokutestu Swallows from 1957 to 1963 and managed the Sankei Atoms from 1966 to 1968 and the 1969 Nankai Hawks.
June 21 – Bud Stewart, 84, outfielder who was the American League runner-up in triples with the 1948 Washington Senators.
June 23 – Bob Tillman, 63, catcher for the Red Sox and Braves who caught two no-hitters and had three home runs in a single 1969 game.
August 6 – Marv Felderman, 64, backup catcher for the 1942 Chicago Cubs.
August 12 – Noboru Akiyama, 66, Hall of Fame NPB pitcher who played for the Taiyo Whales from 1956 to 1967.
August 14 – Ken Heintzelman, 84, pitcher for the Pittsburgh Pirates and the Philadelphia Phillies between 1937 and 1952, who led the National League in shutouts in 1949 and was a member of the Phillies pennant winners in 1953.
August 21 – Russ Kerns, 79, pinch-hitter who played briefly for the 1945 Detroit Tigers.
August 22 – Bill Bradford, 78, pitcher for the 1956 Kansas City Athletics.
September 4 – Pinky May, 89, All-Star second baseman for the Philadelphia Phillies from 1939 to 1943, who led his team in seven offensive categories in 1940, including a .293 batting average and a .371 on-base percentage.
September 7 – Nick Tremark, 87, outfielder for the Brooklyn Dodgers from 1934 through 1936.
September 14 – George Myatt, 86, major league infielder, coach and manager during a professional career that spanned more than four decades.
September 16 – John Perkovich, 76, pitcher for the 1950 Chicago White Sox.
October 1 – Charlie Brewster, 83, backup infielder who played in 69 games for the Reds, Phillies, Cubs and Indians between 1943 and 1946.
October 4 – Chuck Oertel, 69, backup outfielder for the 1958 Baltimore Orioles.
October 17 – Donna Jogerst, 68, All-American Girls Professional Baseball League player.
October 22 – Hank Wyse. 82, All-Star pitcher who helped the Cubs to clinch the 1945 National League title after going 22-10 with a 2.68 ERA, and also the last Cubs pitcher to appear in a World Series game.
October 23 – Benny Culp, 86, catcher for the Philadelphia Phillies 1942 to 1944, one of many baseball players whose career was interrupted by serving in World War II.
October 26 – Ruth Lessing, 75, three-time All-Star catcher in the All-American Girls Professional Baseball League.
November 2 – Eddie Collins, 83, backup outfielder for the Philadelphia Athletics between 1939 and 1942, who later worked in the Philadelphia Phillies' front office.
November 5 – Willard Marshall, 79, All-Star outfielder for the New York Giants, Boston Braves, Cincinnati Reds and Chicago White Sox from 1942 to 1955, who in 1947 tied a National League record by hitting a three-home run game, and in 1951 became the second OF in major league history to play an error-less season.
November 5 – Harry Taylor, 81, pitcher for the Brooklyn Dodgers and Boston Red Sox between 1946 and 1952, who started Game 4 of the 1947 World Series for the Dodgers.
November 14 – Len Gabrielson, 85, first baseman who appeared in five games for the Philadelphia Phillies in the 1939 season.
November 25 – Hugh Alexander, 83, outfielder for the 1937 Cleveland Indians, who later became a scout for 61 years after losing his left hand in an accident.
November 27 – Clara Chiano, 79, American Girls Professional Baseball League player.