| 1989 UAAP season | |
| Lowerseed: | |
| Higherseed Game1: | 83 |
| Higherseed Game2: | 69 |
| Higherseed Series: | 0+1 |
| Lowerseed Game1: | 90 |
| Lowerseed Game2: | 74 |
| Lowerseed Series: | 2 |
| Duration: | October 15, 1989 |
| Coach: | Derrick Pumaren |
| Network: | IBC-13 |
| Prevlink: | UAAP Season 51 men's basketball tournament |
| Prev: | 51 |
| Seasonlink: | UAAP Season 52 men's basketball tournament |
| Year: | 1989 |
| Nextlink: | UAAP Season 53 |
| Next: | 53 |
The 1989 UAAP men's basketball tournament was the 52nd year of the men's tournament of the University Athletic Association of the Philippines (UAAP)'s basketball championship. De La Salle University won their first UAAP crown at the expense of FEU Tamaraws.
Tournament format:
| Date | First game | Second game | Third game | Fourth game | Venue | |
|---|---|---|---|---|---|---|
| July 23 recap | FEU 93 UP 74 | La Salle 88 UST 69 | Ateneo 85 NU 72 | UE 92 Adamson 91 | Araneta Coliseum | |
| July 30 recap | Ateneo 81 UST 78 | Adamson 88 UP 71 | FEU 97 NU 65 | La Salle 81 UE 80 | ||
| August 4 recap | FEU 102 Ateneo 92 | UE 104 UST 75 | Adamson 79 NU 78 | La Salle 78 UP 69 | ||
| August 13 recap | UE 107 Ateneo 90 | Adamson 112 FEU 110 OT | La Salle 94 NU 65 | UP 123 UST 81 | ||
| August 17 recap | UST 84 NU 79 | Ateneo 74 Adamson 71 | UP 92 UE 71 | La Salle 111 FEU 101 | ||
| August 20 recap | La Salle 91 Adamson 89 | UE 76 NU 74 | UP 84 Ateneo 71 | FEU 101 UST 90 | Rizal Coliseum | |
| August 27 recap | La Salle 77 Ateneo 69 | UP 97 NU 84 | FEU 97 UE 95 | Adamson 115 UST 72 | Rizal Coliseum |
FEU Tamaraws and De La Salle Green Archers were tied at 11 wins and two losses going into the final playing date. The Tamaraws edged the Green Archers, 78-77, on free throws by Andy De Guzman as FEU is one win away from winning the crown.
The Tamaraws narrowly missed winning Game one of the finals as they were dragged into overtime before yielding. Andy de Guzman of FEU knotted the count at 77-all with 19 seconds left in regulation period.
The Archers trailed by six points, 47-53, when a 13-1 run gave La Salle a 60-54 advantage. The Tamaraws came within 67-71, on two free throws by rookie playmaker Johnny Abarrientos, but Green Archer Eddie Viaplana hit a three-pointer to iced the game, 74-67 for La Salle, with 35 seconds remaining.