 | | San Diego | 72 | | 9-7 |  | | Gonzaga | 62 | | 5-10 | | Mar 2, 1991 | |  | | San Francisco | 101 | | 4-10 |  | | Loyola Marymount | 93 | | 9-7 | | Mar 2, 1991 | |  | | Portland | 62 | | 3-12 |  | | Pepperdine | 97 | | 16-1 | | Mar 2, 1991 | |  | | Saint Mary's | 79 | | 9-8 |  | | Santa Clara | 74 | | 8-8 | | Mar 2, 1991 | |
| | | San Diego | 72 | | 9-7 | | | Saint Mary's | 75 | | 9-8 | | Mar 3, 1991 | | | | San Francisco | 56 | | 4-10 | | | Pepperdine | 65 | | 16-1 | | Mar 3, 1991 | |
| | | Saint Mary's | 68 | | 9-8 | | | Pepperdine | 71 | | 16-1 | | Mar 4, 1991 | |
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