The following are the baseball events of the year 1990 throughout the world.
| League Championship Series (ALCS, NLCS) | World Series | ||||||||
| East | Boston | 0 | |||||||
| West | Oakland | 4 | |||||||
| AL | Oakland | 0 | |||||||
| NL | Cincinnati | 4 | |||||||
| East | Pittsburgh | 2 | |||||||
| West | Cincinnati | 4 | |||||||
| American League | National League | |||
|---|---|---|---|---|
| Type | Name | Stat | Name | Stat |
| AVG | George Brett KCR | .329 | Willie McGee STL | .335 |
| HR | Cecil Fielder DET | 51 | Ryne Sandberg CHC | 40 |
| RBI | Cecil Fielder DET | 132 | Matt Williams SFG | 122 |
| Wins | Bob Welch OAK | 27 | Doug Drabek PIT | 22 |
| ERA | Roger Clemens BOS | 1.93 | Danny Darwin HOU | 2.21 |
| Ks | Nolan Ryan TEX | 232 | David Cone NYM | 233 |
| Team | W | L | Pct. | GB | Home | Road |
|---|---|---|---|---|---|---|
| Boston Red Sox | 88 | 74 | .543 | — | 51–30 | 37–44 |
| Toronto Blue Jays | 86 | 76 | .531 | 2 | 44–37 | 42–39 |
| Detroit Tigers | 79 | 83 | .488 | 9 | 39–42 | 40–41 |
| Cleveland Indians | 77 | 85 | .475 | 11 | 41–40 | 36–45 |
| Baltimore Orioles | 76 | 85 | .472 | 11½ | 40–40 | 36–45 |
| Milwaukee Brewers | 74 | 88 | .457 | 14 | 39–42 | 35–46 |
| New York Yankees | 67 | 95 | .414 | 21 | 37–44 | 30–51 |
| Team | W | L | Pct. | GB | Home | Road |
|---|---|---|---|---|---|---|
| Oakland Athletics | 103 | 59 | .636 | — | 51–30 | 52–29 |
| Chicago White Sox | 94 | 68 | .580 | 9 | 49–31 | 45–37 |
| Texas Rangers | 83 | 79 | .512 | 20 | 47–35 | 36–44 |
| California Angels | 80 | 82 | .494 | 23 | 42–39 | 38–43 |
| Seattle Mariners | 77 | 85 | .475 | 26 | 38–43 | 39–42 |
| Kansas City Royals | 75 | 86 | .466 | 27½ | 45–36 | 30–50 |
| Minnesota Twins | 74 | 88 | .457 | 29 | 41–40 | 33–48 |
| Team | W | L | Pct. | GB | Home | Road |
|---|---|---|---|---|---|---|
| Pittsburgh Pirates | 95 | 67 | .586 | — | 49–32 | 46–35 |
| New York Mets | 91 | 71 | .562 | 4 | 52–29 | 39–42 |
| Montreal Expos | 85 | 77 | .525 | 10 | 47–34 | 38–43 |
| Chicago Cubs | 77 | 85 | .475 | 18 | 39–42 | 38–43 |
| Philadelphia Phillies | 77 | 85 | .475 | 18 | 41–40 | 36–45 |
| St. Louis Cardinals | 70 | 92 | .432 | 25 | 34–47 | 36–45 |
| Team | W | L | Pct. | GB | Home | Road |
|---|---|---|---|---|---|---|
| Cincinnati Reds | 91 | 71 | .562 | — | 46–35 | 45–36 |
| Los Angeles Dodgers | 86 | 76 | .531 | 5 | 47–34 | 39–42 |
| San Francisco Giants | 85 | 77 | .525 | 6 | 49–32 | 36–45 |
| Houston Astros | 75 | 87 | .463 | 16 | 49–32 | 26–55 |
| San Diego Padres | 75 | 87 | .463 | 16 | 37–44 | 38–43 |
| Atlanta Braves | 65 | 97 | .401 | 26 | 37–44 | 28–53 |
| Team | Manager | Comments |
|---|---|---|
| Baltimore Orioles | Frank Robinson | |
| Boston Red Sox | Joe Morgan | Won AL East title |
| California Angels | Doug Rader | |
| Chicago White Sox | Jeff Torborg | AL Manager of the Year |
| Cleveland Indians | John McNamara | First season as Indians manager |
| Detroit Tigers | Sparky Anderson | 12th season as Tigers manager |
| Kansas City Royals | John Wathan | |
| Milwaukee Brewers | Tom Trebelhorn | |
| Minnesota Twins | Tom Kelly | |
| New York Yankees | Bucky Dent | Replaced during the season by Stump Merrill |
| Oakland Athletics | Tony La Russa | Won AL Pennant |
| Seattle Mariners | Jim Lefebvre | |
| Texas Rangers | Bobby Valentine | |
| Toronto Blue Jays | Cito Gaston |
| Team | Manager | Comments |
|---|---|---|
| Atlanta Braves | Russ Nixon | Replaced during the season by Bobby Cox |
| Chicago Cubs | Don Zimmer | |
| Cincinnati Reds | Lou Piniella | Won the World Series |
| Houston Astros | Art Howe | 2nd season with the Astros |
| Los Angeles Dodgers | Tommy Lasorda | |
| Montreal Expos | Buck Rodgers | |
| New York Mets | Davey Johnson | Replaced during the season by Bud Harrelson |
| Philadelphia Phillies | Nick Leyva | |
| Pittsburgh Pirates | Jim Leyland | NL East Division title |
| St. Louis Cardinals | Whitey Herzog | Replaced during the season by Joe Torre |
| San Diego Padres | Jack McKeon | Replaced during the season by Greg Riddoch |
| San Francisco Giants | Roger Craig | 6th season with the Giants |