| 27.09.1998 | | D.C. United | | Columbus Crew | | 3:2 (1:2), pen. ?:? |
| Washington |
| 27.09.1998 | | Los Angeles Galaxy | | Chicago Fire | | 1:0 (0:0) |
| Pasadena |
| 27.09.1998 | | Miami Fusion | | Tampa Bay Mutiny | | 1:3 (1:1) |
| Fort Lauderdale |
| 27.09.1998 | | San Jos? Clash | | Kansas City Wizards | | 2:0 (1:0) |
| San Jos? |
| 26.09.1998 | | Colorado Rapids | | Dallas Burn | | 3:1 (3:0) |
| Denver |
| 26.09.1998 | | New England Revolution | | MetroStars | | 0:1 (0:0), pen. ?:? |
| Foxborough |
| 24.09.1998 | | Columbus Crew | | Tampa Bay Mutiny | | 3:4 (1:2) |
| Columbus |
| 23.09.1998 | | Chicago Fire | | New England Revolution | | 3:2 (1:1) |
| Chicago |
| 20.09.1998 | | Los Angeles Galaxy | | San Jos? Clash | | 0:1 (0:1) |
| Pasadena |
| 19.09.1998 | | Colorado Rapids | | Columbus Crew | | 2:1 (1:1) |
| Denver |
| 19.09.1998 | | D.C. United | | Miami Fusion | | 1:3 (0:1) |
| Washington |
| 19.09.1998 | | Kansas City Wizards | | Dallas Burn | | 0:1 (0:1) |
| Kansas City |
| 19.09.1998 | | New England Revolution | | Tampa Bay Mutiny | | 3:0 |
| Foxborough |
| 17.09.1998 | | Chicago Fire | | Kansas City Wizards | | 1:0 (0:0) |
| Chicago |
| 16.09.1998 | | Columbus Crew | | Colorado Rapids | | 2:4 (0:1) |
| Columbus |
| 16.09.1998 | | MetroStars | | D.C. United | | 0:5 |
| East Rutherford |
| 16.09.1998 | | San Jos? Clash | | Los Angeles Galaxy | | 0:1 (0:0), pen. ?:? |
| San Jos? |
| 13.09.1998 | | Chicago Fire | | Colorado Rapids | | 3:1 (3:0) |
| Chicago |
| 13.09.1998 | | Dallas Burn | | San Jos? Clash | | 1:3 (1:1) |
| Dallas |
| 13.09.1998 | | Miami Fusion | | D.C. United | | 4:3 (3:1) |
| Fort Lauderdale |
| 13.09.1998 | | Tampa Bay Mutiny | | MetroStars | | 2:1 (0:1) |
| Tampa |
| 12.09.1998 | | New England Revolution | | Columbus Crew | | 2:0 (1:0) |
| Foxborough |
| 10.09.1998 | | Dallas Burn | | Chicago Fire | | 3:2 (1:0) |
| Dallas |
| 09.09.1998 | | Columbus Crew | | Miami Fusion | | 1:0 (0:0) |
| Columbus |
| 06.09.1998 | | Columbus Crew | | MetroStars | | 4:3 (2:1) |
| Columbus |
| 05.09.1998 | | Kansas City Wizards | | San Jos? Clash | | 5:1 (2:1) |
| Kansas City |
| 05.09.1998 | | Miami Fusion | | Los Angeles Galaxy | | 3:5 (0:1) |
| Fort Lauderdale |
| 03.09.1998 | | Tampa Bay Mutiny | | San Jos? Clash | | 2:1 (1:0) |
| Tampa |
| 02.09.1998 | | Chicago Fire | | Miami Fusion | | 3:2 (2:0) |
| Chicago |
| 02.09.1998 | | Colorado Rapids | | Kansas City Wizards | | 3:2 (0:1) |
| Denver |
| 02.09.1998 | | Los Angeles Galaxy | | Dallas Burn | | 3:0 (1:0) |
| Pasadena |
| 02.09.1998 | | MetroStars | | New England Revolution | | 0:2 (0:2) |
| East Rutherford |
| 30.08.1998 | | Miami Fusion | | New England Revolution | | 3:2 (2:0) |
| Fort Lauderdale |
| 29.08.1998 | | Dallas Burn | | MetroStars | | 2:0 (0:0) |
| Dallas |
| 29.08.1998 | | Kansas City Wizards | | Chicago Fire | | 2:3 (2:0), pen. ?:? |
| Kansas City |
| 29.08.1998 | | Los Angeles Galaxy | | Columbus Crew | | 0:3 (0:2) |
| Pasadena |
| 29.08.1998 | | San Jos? Clash | | Colorado Rapids | | 1:3 (0:2) |
| San Jos? |
| 29.08.1998 | | Tampa Bay Mutiny | | D.C. United | | 3:2 (1:1), pen. ?:? |
| Tampa |
| 26.08.1998 | | Kansas City Wizards | | D.C. United | | 1:2 (1:0) |
| Kansas City |
| 23.08.1998 | | Kansas City Wizards | | Miami Fusion | | 2:0 (1:0) |
| Kansas City |
| 22.08.1998 | | Columbus Crew | | Tampa Bay Mutiny | | 3:1 (0:1) |
| Columbus |
| 22.08.1998 | | D.C. United | | MetroStars | | 2:1 (0:1) |
| Washington |
| 22.08.1998 | | New England Revolution | | Los Angeles Galaxy | | 1:5 (0:1) |
| Foxborough |
| 22.08.1998 | | San Jos? Clash | | Dallas Burn | | 2:1 (1:0), pen. ?:? |
| San Jos? |
| 21.08.1998 | | Colorado Rapids | | Chicago Fire | | 0:2 (0:0) |
| Denver |
| 19.08.1998 | | Miami Fusion | | Dallas Burn | | 2:1 (0:0) |
| Fort Lauderdale |
| 18.08.1998 | | MetroStars | | Colorado Rapids | | 4:1 (1:1) |
| East Rutherford |
| 16.08.1998 | | Columbus Crew | | Kansas City Wizards | | 5:3 (1:1) |
| Columbus |
| 15.08.1998 | | Chicago Fire | | San Jos? Clash | | 2:1 (1:1) |
| Chicago |
| 15.08.1998 | | Colorado Rapids | | Dallas Burn | | 0:1 (0:0) |
| Denver |
| 15.08.1998 | | Miami Fusion | | MetroStars | | 3:1 (0:0) |
| Fort Lauderdale |
| 14.08.1998 | | Tampa Bay Mutiny | | New England Revolution | | 1:2 (1:1), pen. ?:? |
| Tampa |
| 13.08.1998 | | Los Angeles Galaxy | | Kansas City Wizards | | 3:0 (1:0) |
| Pasadena |
| 12.08.1998 | | MetroStars | | Columbus Crew | | 3:1 (0:0) |
| East Rutherford |
| 09.08.1998 | | San Jos? Clash | | MetroStars | | 5:1 (1:1) |
| San Jos? |
| 08.08.1998 | | Chicago Fire | | Los Angeles Galaxy | | 1:2 |
| Chicago |
| 08.08.1998 | | Columbus Crew | | New England Revolution | | 6:1 (3:0) |
| Columbus |
| 08.08.1998 | | Kansas City Wizards | | Colorado Rapids | | 3:1 (0:1) |
| Kansas City |
| 07.08.1998 | | Dallas Burn | | D.C. United | | 0:1 (0:0) |
| Dallas |
| 06.08.1998 | | Tampa Bay Mutiny | | Miami Fusion | | 3:1 (2:1) |
| Tampa |
| 05.08.1998 | | Colorado Rapids | | Los Angeles Galaxy | | 1:6 (0:3) |
| Denver |
| 05.08.1998 | | New England Revolution | | San Jos? Clash | | 3:0 (2:0) |
| Foxborough |
| 29.07.1998 | | D.C. United | | Tampa Bay Mutiny | | 3:2 (1:0), pen. ?:? |
| Washington |
| 29.07.1998 | | Dallas Burn | | Los Angeles Galaxy | | 3:0 (1:0) |
| Dallas |
| 29.07.1998 | | MetroStars | | Kansas City Wizards | | 3:2 (1:2), pen. ?:? |
| East Rutherford |
| 29.07.1998 | | Miami Fusion | | Columbus Crew | | 3:2 (2:0) |
| Fort Lauderdale |
| 29.07.1998 | | New England Revolution | | Colorado Rapids | | 1:3 (1:1) |
| Foxborough |
| 29.07.1998 | | San Jos? Clash | | Chicago Fire | | 3:0 (1:0) |
| San Jos? |
| 26.07.1998 | | New England Revolution | | Miami Fusion | | 1:2 (0:1) |
| Foxborough |
| 25.07.1998 | | Columbus Crew | | Dallas Burn | | 1:2 (1:1) |
| Columbus |
| 25.07.1998 | | Los Angeles Galaxy | | D.C. United | | 0:1 |
| Pasadena |
| 25.07.1998 | | MetroStars | | Chicago Fire | | 3:2 (3:1) |
| East Rutherford |
| 25.07.1998 | | San Jos? Clash | | Kansas City Wizards | | 2:1 (1:1), pen. ?:? |
| San Jos? |
| 25.07.1998 | | Tampa Bay Mutiny | | Colorado Rapids | | 2:3 (1:1) |
| Tampa |
| 19.07.1998 | | Kansas City Wizards | | Colorado Rapids | | 4:1 (1:1) |
| Kansas City |
| 19.07.1998 | | MetroStars | | Columbus Crew | | 3:0 (2:0) |
| East Rutherford |
| 18.07.1998 | | D.C. United | | Chicago Fire | | 4:1 (0:1) |
| Washington |
| 18.07.1998 | | Dallas Burn | | New England Revolution | | 1:3 (1:0) |
| Dallas |
| 18.07.1998 | | Los Angeles Galaxy | | Miami Fusion | | 2:3 (0:0), pen. ?:? |
| Pasadena |
| 18.07.1998 | | San Jos? Clash | | Tampa Bay Mutiny | | 0:1 (0:0) |
| San Jos? |
| 15.07.1998 | | Miami Fusion | | San Jos? Clash | | 3:2 (1:1), pen. ?:? |
| Fort Lauderdale |
| 15.07.1998 | | New England Revolution | | D.C. United | | 0:1 (0:0) |
| Foxborough |
| 15.07.1998 | | Tampa Bay Mutiny | | Los Angeles Galaxy | | 1:3 (1:2) |
| Tampa |
| 11.07.1998 | | Colorado Rapids | | New England Revolution | | 2:1 (2:1) |
| Denver |
| 11.07.1998 | | Kansas City Wizards | | Dallas Burn | | 2:0 (0:0) |
| Kansas City |
| 11.07.1998 | | MetroStars | | Tampa Bay Mutiny | | 1:2 (1:1) |
| East Rutherford |
| 10.07.1998 | | D.C. United | | Los Angeles Galaxy | | 3:0 (2:0) |
| Washington |
| 09.07.1998 | | Columbus Crew | | Chicago Fire | | 3:0 (2:0) |
| Columbus |
| 04.07.1998 | | Colorado Rapids | | MetroStars | | 1:0 (0:0) |
| Denver |
| 04.07.1998 | | Dallas Burn | | Chicago Fire | | 0:1 (0:1) |
| Dallas |
| 04.07.1998 | | Los Angeles Galaxy | | Kansas City Wizards | | 2:0 (1:0) |
| Pasadena |
| 04.07.1998 | | Tampa Bay Mutiny | | New England Revolution | | 2:3 (0:0) |
| Tampa |
| 03.07.1998 | | San Jos? Clash | | Columbus Crew | | 2:1 (0:1), pen. ?:? |
| San Jos? |
| 02.07.1998 | | D.C. United | | Miami Fusion | | 3:1 (1:0) |
| Washington |
| 01.07.1998 | | Chicago Fire | | Dallas Burn | | 4:1 (4:1) |
| Chicago |
| 01.07.1998 | | Kansas City Wizards | | New England Revolution | | 1:0 (0:0) |
| Kansas City |
| 27.06.1998 | | Miami Fusion | | Tampa Bay Mutiny | | 2:1 (0:0), pen. ?:? |
| Fort Lauderdale |
| 27.06.1998 | | New England Revolution | | Dallas Burn | | 3:4 (3:2), pen. ?:? |
| Foxborough |
| 27.06.1998 | | San Jos? Clash | | Los Angeles Galaxy | | 1:2 (1:0) |
| San Jos? |
| 25.06.1998 | | Colorado Rapids | | D.C. United | | 3:1 (3:0) |
| Denver |
| 24.06.1998 | | Chicago Fire | | Kansas City Wizards | | 4:1 (2:1) |
| Chicago |
| 24.06.1998 | | MetroStars | | New England Revolution | | 5:3 (2:1) |
| East Rutherford |
| 21.06.1998 | | Dallas Burn | | Tampa Bay Mutiny | | 0:1 (0:0) |
| Dallas |
| 20.06.1998 | | Columbus Crew | | MetroStars | | 2:1 (1:1) |
| Columbus |
| 18.06.1998 | | Los Angeles Galaxy | | Colorado Rapids | | 2:1 (0:1) |
| Pasadena |
| 17.06.1998 | | Chicago Fire | | Dallas Burn | | 1:0 (0:0) |
| Chicago |
| 14.06.1998 | | New England Revolution | | Chicago Fire | | 1:3 (1:1) |
| Foxborough |
| 13.06.1998 | | Columbus Crew | | D.C. United | | 3:4 (2:2), pen. ?:? |
| Columbus |
| 13.06.1998 | | MetroStars | | Miami Fusion | | 3:1 (1:0) |
| East Rutherford |
| 11.06.1998 | | Chicago Fire | | San Jos? Clash | | 5:2 (2:0) |
| Chicago |
| 07.06.1998 | | D.C. United | | Dallas Burn | | 4:5 (2:2), pen. ?:? |
| Washington |
| 07.06.1998 | | Los Angeles Galaxy | | New England Revolution | | 5:1 (1:1) |
| Pasadena |
| 07.06.1998 | | Miami Fusion | | MetroStars | | 1:2 (0:1) |
| Fort Lauderdale |
| 06.06.1998 | | Chicago Fire | | Columbus Crew | | 2:0 (1:0) |
| Chicago |
| 06.06.1998 | | Colorado Rapids | | San Jos? Clash | | 2:0 (0:0) |
| Denver |
| 06.06.1998 | | Kansas City Wizards | | Tampa Bay Mutiny | | 1:0 (1:0) |
| Kansas City |
| 04.06.1998 | | Dallas Burn | | Los Angeles Galaxy | | 1:8 (1:3) |
| Dallas |
| 03.06.1998 | | MetroStars | | Tampa Bay Mutiny | | 1:2 (1:1) |
| East Rutherford |
| 03.06.1998 | | San Jos? Clash | | D.C. United | | 0:4 (0:1) |
| San Jos? |
| 31.05.1998 | | Colorado Rapids | | Kansas City Wizards | | 2:1 (2:0) |
| Denver |
| 31.05.1998 | | Dallas Burn | | Miami Fusion | | 2:0 (1:0) |
| Dallas |
| 31.05.1998 | | New England Revolution | | MetroStars | | 1:2 (0:0), pen. ?:? |
| Foxborough |
| 30.05.1998 | | Columbus Crew | | San Jos? Clash | | 4:1 (1:1) |
| Columbus |
| 30.05.1998 | | Los Angeles Galaxy | | Chicago Fire | | 1:2 (1:0), pen. ?:? |
| Pasadena |
| 30.05.1998 | | Tampa Bay Mutiny | | D.C. United | | 1:2 (1:0), pen. ?:? |
| Tampa |
| 28.05.1998 | | Colorado Rapids | | Miami Fusion | | 3:0 (0:0) |
| Denver |
| 27.05.1998 | | Kansas City Wizards | | Columbus Crew | | 2:1 (0:0), pen. ?:? |
| Kansas City |
| 23.05.1998 | | Chicago Fire | | Colorado Rapids | | 5:0 (1:0) |
| Chicago |
| 23.05.1998 | | D.C. United | | Tampa Bay Mutiny | | 3:2 (1:2) |
| Washington |
| 23.05.1998 | | Kansas City Wizards | | San Jos? Clash | | 0:1 (0:1) |
| Kansas City |
| 23.05.1998 | | Los Angeles Galaxy | | Dallas Burn | | 4:1 (2:0) |
| Pasadena |
| 23.05.1998 | | MetroStars | | Miami Fusion | | 4:2 (3:1) |
| East Rutherford |
| 22.05.1998 | | New England Revolution | | Columbus Crew | | 0:2 (0:1) |
| Foxborough |
| 20.05.1998 | | Chicago Fire | | Los Angeles Galaxy | | 3:1 (1:0) |
| Chicago |
| 20.05.1998 | | Dallas Burn | | Kansas City Wizards | | 1:2 (0:0), pen. ?:? |
| Dallas |
| 17.05.1998 | | Columbus Crew | | Los Angeles Galaxy | | 2:4 (1:0) |
| Columbus |
| 16.05.1998 | | Dallas Burn | | Colorado Rapids | | 2:1 (1:0) |
| Dallas |
| 16.05.1998 | | MetroStars | | D.C. United | | 4:3 (2:0) |
| East Rutherford |
| 16.05.1998 | | New England Revolution | | Kansas City Wizards | | 1:3 (0:0) |
| Foxborough |
| 16.05.1998 | | San Jos? Clash | | Miami Fusion | | 2:0 (1:0) |
| San Jos? |
| 16.05.1998 | | Tampa Bay Mutiny | | Chicago Fire | | 1:2 (1:1) |
| Tampa |
| 13.05.1998 | | D.C. United | | New England Revolution | | 3:2 (1:0) |
| Washington |
| 13.05.1998 | | Tampa Bay Mutiny | | Kansas City Wizards | | 2:1 (0:0) |
| Tampa |
| 10.05.1998 | | New England Revolution | | Tampa Bay Mutiny | | 4:3 (1:2) |
| Foxborough |
| 09.05.1998 | | Colorado Rapids | | San Jos? Clash | | 2:3 (1:1) |
| Denver |
| 09.05.1998 | | D.C. United | | MetroStars | | 2:0 (1:0) |
| Washington |
| 09.05.1998 | | Miami Fusion | | Columbus Crew | | 2:0 (1:0) |
| Fort Lauderdale |
| 06.05.1998 | | Los Angeles Galaxy | | Colorado Rapids | | 7:4 (3:2) |
| Pasadena |
| 06.05.1998 | | MetroStars | | Dallas Burn | | 0:1 (0:1) |
| East Rutherford |
| 03.05.1998 | | San Jos? Clash | | New England Revolution | | 1:3 (1:2) |
| San Jos? |
| 03.05.1998 | | Tampa Bay Mutiny | | MetroStars | | 0:1 (0:0) |
| Tampa |
| 02.05.1998 | | Chicago Fire | | D.C. United | | 1:3 (1:1) |
| Chicago |
| 02.05.1998 | | Miami Fusion | | Colorado Rapids | | 3:2 (1:0) |
| Fort Lauderdale |
| 30.04.1998 | | Tampa Bay Mutiny | | Columbus Crew | | 0:1 (0:0) |
| Tampa |
| 29.04.1998 | | D.C. United | | San Jos? Clash | | 3:1 (1:1) |
| Washington |
| 29.04.1998 | | Kansas City Wizards | | Los Angeles Galaxy | | 0:2 (0:1) |
| Kansas City |
| 26.04.1998 | | D.C. United | | Columbus Crew | | 2:1 (0:1), pen. ?:? |
| Washington |
| 25.04.1998 | | Colorado Rapids | | Chicago Fire | | 5:4 (3:2), pen. ?:? |
| Denver |
| 25.04.1998 | | Dallas Burn | | Kansas City Wizards | | 3:1 (0:1) |
| Dallas |
| 25.04.1998 | | Los Angeles Galaxy | | Tampa Bay Mutiny | | 5:1 (2:1) |
| Pasadena |
| 25.04.1998 | | MetroStars | | San Jos? Clash | | 4:3 (1:2) |
| East Rutherford |
| 25.04.1998 | | New England Revolution | | Miami Fusion | | 3:0 (2:0) |
| Foxborough |
| 19.04.1998 | | Colorado Rapids | | Tampa Bay Mutiny | | 3:0 (0:0) |
| Denver |
| 18.04.1998 | | Columbus Crew | | Miami Fusion | | 5:1 (1:0) |
| Columbus |
| 18.04.1998 | | Dallas Burn | | San Jos? Clash | | 1:2 (0:0) |
| Dallas |
| 18.04.1998 | | Kansas City Wizards | | Los Angeles Galaxy | | 1:2 (0:1) |
| Kansas City |
| 18.04.1998 | | New England Revolution | | D.C. United | | 2:1 (1:1), pen. ?:? |
| Foxborough |
| 17.04.1998 | | Chicago Fire | | MetroStars | | 0:1 (0:1) |
| Chicago |
| 11.04.1998 | | Columbus Crew | | New England Revolution | | 3:2 (1:0) |
| Columbus |
| 11.04.1998 | | D.C. United | | Colorado Rapids | | 4:3 (2:1), pen. ?:? |
| Washington |
| 11.04.1998 | | MetroStars | | Los Angeles Galaxy | | 2:3 (1:1) |
| East Rutherford |
| 11.04.1998 | | Miami Fusion | | Kansas City Wizards | | 2:1 (1:0), pen. ?:? |
| Fort Lauderdale |
| 11.04.1998 | | San Jos? Clash | | Chicago Fire | | 1:0 (1:0) |
| Palo Alto |
| 11.04.1998 | | Tampa Bay Mutiny | | Dallas Burn | | 3:1 (2:0) |
| Tampa |
| 08.04.1998 | | Kansas City Wizards | | Chicago Fire | | 1:0 (0:0) |
| Kansas City |
| 05.04.1998 | | San Jos? Clash | | Dallas Burn | | 2:3 (1:1), pen. ?:? |
| Palo Alto |
| 04.04.1998 | | Chicago Fire | | Tampa Bay Mutiny | | 2:0 (1:0) |
| Chicago |
| 04.04.1998 | | Colorado Rapids | | Los Angeles Galaxy | | 0:1 (0:1) |
| Denver |
| 04.04.1998 | | Columbus Crew | | D.C. United | | 2:1 (1:1) |
| Columbus |
| 04.04.1998 | | Kansas City Wizards | | MetroStars | | 2:0 (1:0) |
| Kansas City |
| 04.04.1998 | | Miami Fusion | | New England Revolution | | 2:1 (1:1) |
| Fort Lauderdale |
| 29.03.1998 | | D.C. United | | New England Revolution | | 2:1 (0:0), pen. ?:? |
| Washington |
| 29.03.1998 | | Dallas Burn | | Columbus Crew | | 2:1 (1:1) |
| Dallas |
| 28.03.1998 | | Los Angeles Galaxy | | MetroStars | | 3:2 (1:1) |
| Pasadena |
| 28.03.1998 | | San Jos? Clash | | Colorado Rapids | | 2:3 (0:1), pen. ?:? |
| Palo Alto |
| 26.03.1998 | | Tampa Bay Mutiny | | Miami Fusion | | 0:1 (0:0), pen. ?:? |
| Tampa |
| 21.03.1998 | | D.C. United | | Kansas City Wizards | | 3:2 (2:2) |
| Washington |
| 21.03.1998 | | Dallas Burn | | Colorado Rapids | | 2:1 (1:1), pen. ?:? |
| Dallas |
| 21.03.1998 | | Los Angeles Galaxy | | San Jos? Clash | | 4:3 (2:1), pen. ?:? |
| Pasadena |
| 21.03.1998 | | Miami Fusion | | Chicago Fire | | 0:2 (0:0) |
| Fort Lauderdale |
| 21.03.1998 | | Tampa Bay Mutiny | | Columbus Crew | | 1:2 (0:1) |
| Tampa |
| 15.03.1998 | | Miami Fusion | | D.C. United | | 0:2 (0:2) |
| Fort Lauderdale |