With import Michael Phelps , San Miguel won the Open Conferencethe first conference championship of the seasonagainst Formula Shell Zoom Masters led by Bobby Parks . The Beermen struggled in the elimination round of the All-Filipino Conference but went into the final against Purefoods Hotdogs and won the championship series in six games . In the final conference of the season , the Reinforced Conference , the Beermen performed poorly in the elimination round and won most of their games in the semifinal round . They advanced to the finals against sister team Añejo Rum 65ers . They have won their best-of-seven series against the 65ers in five games
Reinforced Conference
1989 PBA Reinforced Conference
Grand Slam (PBA)